STC 89c51 Series EEPROM test procedure

1 Test procedure

2 Certification Procedures

1

/* Microcontroller built-in  eeprom test program for   stc89c51stc89c52stc89c53stc89c54stc89c58stc89c510stc89c512stc89c514 Test Crystal oscillator:11.05926m 12m  can be used   Function: Reads a byte content of the specified address, and displays the erase of a sector on the 8&NBSP;P1 bus, modifies a byte content of the specified address, and displays it on the 8&NBSP;P1 bus */#include  <reg51.h> #include  <intrins.h>/******************eeprom used in the SFR register address STC model different address different ************************************** /SFR&NBSP;IAP_DATA&NBSP;&NBSP;&NBSP;&NBSP;=&NBSP;0XE2;&NBSP;&NBSP;&NBSP;//IAP Data registers (read and write data from Flash) at the time of operation SFR&NBSP;IAP_ADDRH&NBSP;&NBSP;&NBSP;=&NBSP;0XE3;&NBSP;&NBSP;&NBSP;//IAP High 8-bit sfr iap_addrl  when operating the address register &NBSP;&NBSP;=&NBSP;0XE4;&NBSP;&NBSP;&NBSP;//&NBSP;IAP Operation address Register low 8-bit sfr iap_cmd     &NBSP;=&NBSP;0XE5;&NBSP;//IAP Command mode register (requires command trigger register trigger to take effect) 3 modes sfr iap_trig    = 0xe6; &NBSP;//IAP Command trigger register, at Iap_contr.7=1, Iap_trig first write//into 46h, then write B9H,IAP command takes effect sfr iap_contr   =  0XE7;&NBSP;//IAP Control Register  /*********** defines flash  operation wait time and constants that allow iap/isp/eeprom  operations (belonging to the IAP_CONTR register) * */#define &NBSP;ENABLE_ISP&NBSP;0X82&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;//Measurement   12M   11.0592m  can use void delay_ms  (unsigned int a) {    unsigned  int i;    while  ( --a != 0 )     {         for  (i=0;i<=110;i++);     }}/************ * Close IAP Function subroutine *****************************/void iap_disable ()       //Close IAP   Function, -related special function register, so that cpu  in a safe state,{                        //It is recommended to close the IAP after a continuous iap  operation is completed   function, do not need to close every time         IAP_CONTR = 0;       //off iap  function     IAP_CMD   = 0;       //the command register so that the command registers are not deadOrder, this sentence can not be     iap_trig = 0;       //command trigger register, Make the command trigger register no trigger, this sentence can not     iap_addrh = 0;      //high eight-bit address clear 0     iap_addrl = 0;      //low eight-bit address clear 0} /********* *eeprom read a Byte subroutine ***********************/unsigned char byte_read (Unsigned int add)        //read a Byte, the call needs to open iap  function, the entry:dptr =  byte address, return:a =  Read bytes {     IAP_DATA = 0x00;            &NBSP;&NBSP;//IAP Data Register Clear 0    iap_contr = enable_isp;       //Open iap  function,  set flash  operation wait Time     IAP_CMD = 0x01;               //IAP/ISP/EEPROM  Byte Read command      iap_addrh =  (Unsigned char) (add>>8)     //set the destination cell address of the high 8  bit address      IAP_ADDRL =  (Unsigned char) (ADD&AMP;0XFF);     // Sets the low 8  bit address of the destination cell address      ea = 0;    iap_trig =  0x46;   //first Send  46h, and then send b9h  to the isp/iap  trigger register, each time need so &NBSP;&NBSP;&NBSP;&NBSP;IAP_ trig = 0xb9;   //,isp/iap  command is triggered immediately after delivery of the  B9h      _ Nop_ ();     ea = 1;    iap_disable ();  //Close iap  function,   Clear-related special function registers, so that the cpu  in a safe state,                     //once a continuous iap  operation is completed, it is recommended to turn off the iap  function, and do not need to close each      return  (iap_data);}   /************eeprom byte program subroutine **************************/void byte_program (Unsigned int  add, Unsigned char ch)   //byte programming, need to open iap  function before calling, ingress:dptr =  byte address, a=  Data {    iap_contr = enable_isp;        of the required programming bytes   //Open  IAP  function,  set flash  operation wait Time     IAP_CMD = 0x02;                  //iap/ isp/eeprom  byte Programming Command       IAP_ADDRH =  (Unsigned char) (add> &GT;8)     //set the high 8  address of the destination cell address     IAP_ADDRL =  (unsigned  char) (ADD&AMP;0XFF)     //set the low 8  bit address of the destination cell address      iap_data  = ch;                   //the data to be programmed is first sent to the iap_data  register     EA = 0;     iap_trig = 0x46;   //first Send  46h, and then send b9h  to the isp/iap  trigger register, each time need so     iap_trig =  0xb9;   //,isp/iap  command is triggered immediately after delivery  B9h      _nop_ ();     ea = 1;    iap_disable ();  //Close iap  function,  The cpu  is in a safe state by clearing the relevant special function registers,                     //once a continuous iap  operation is completed, it is recommended to turn off the iap  function, and do not need to close each time} /************* EEPROM Erase Sector Sub-program **************************/void sector_erase (Unsigned int add)         //Erase sector,  Ingress:dptr =  sector address {    iap_contr =  enable_isp;         //Open iap  function,  set flash  operation wait Time     IAP_CMD = 0x03;                  //iap/isp/eeprom  Sector Erase Command      IAP_ADDRH =  (Unsigned char) (add &GT;&GT;8)     //set the high 8  address of the destination cell address     IAP_ADDRL =  ( Unsigned char) (ADD&AMP;0XFF)     //set the low 8  address of the destination cell address       ea = 0;    iap_trig = 0x46;   //first Send  46h, then send b9h  To the isp/iap  trigger register, each time it needs to be so     iap_trig = 0xb9;   //sent out  b9h   Post,isp/iap  command is triggered immediately starting     _nop_ ();    ea = 1;     iap_disable ();      //off iap  function,  Clear related special function register, make cpu  In a safe State,                        //It is recommended to turn off the iap  function once a continuous iap  operation is complete, do not need to close}void main  (void) { Unsigned char mydata  = 0x0f;unsigned int  address = 0x2000; P1 = byte_read (address);      //reads the 8 bits of the current location store and displays the Delay_ms (1000); Sector_erase (address);        //Erase the Sector Byte_program (Address,mydata) where this address is located;// Writes a new 8 Bitp1 = byte_read (address),       //reads the 8 bits of the current location store and displays the while (1);}

2

/* Microcontroller built-in  eeprom test program for   stc89c51stc89c52stc89c53stc89c54stc89c58stc89c510stc89c512stc89c514 Test Crystal oscillator:11.05926m 12m  can be used   Function: Reads a byte content of the specified address, and displays the erase of a sector on the 8&NBSP;P1 bus, modifies a byte content of the specified address, and displays it on the 8&NBSP;P1 bus */#include  <reg51.h> #include  <intrins.h>/******************eeprom used in the SFR register address STC model different address different ************************************** /SFR&NBSP;IAP_DATA&NBSP;&NBSP;&NBSP;&NBSP;=&NBSP;0XE2;&NBSP;&NBSP;&NBSP;//IAP Data registers (read and write data from Flash) at the time of operation SFR&NBSP;IAP_ADDRH&NBSP;&NBSP;&NBSP;=&NBSP;0XE3;&NBSP;&NBSP;&NBSP;//IAP High 8-bit sfr iap_addrl  when operating the address register &NBSP;&NBSP;=&NBSP;0XE4;&NBSP;&NBSP;&NBSP;//&NBSP;IAP Operation address Register low 8-bit sfr iap_cmd     &NBSP;=&NBSP;0XE5;&NBSP;//IAP Command mode register (requires command trigger register trigger to take effect) 3 modes sfr iap_trig    = 0xe6; &NBSP;//IAP Command trigger register, at Iap_contr.7=1, Iap_trig first write//into 46h, then write B9H,IAP command takes effect sfr iap_contr   =  0XE7;&NBSP;//IAP Control Register  /*********** defines flash  operation wait time and constants that allow iap/isp/eeprom  operations (belonging to the IAP_CONTR register) * */#define &NBSP;ENABLE_ISP&NBSP;0X82&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;//Measurement   12M   11.0592m  can use void delay_ms  (unsigned int a) {    unsigned  int i;    while  ( --a != 0 )     {         for  (i=0;i<=110;i++);     }}/************ * Close IAP Function subroutine *****************************/void iap_disable ()       //Close IAP   Function, -related special function register, so that cpu  in a safe state,{                        //It is recommended to close the IAP after a continuous iap  operation is completed   function, do not need to close every time         IAP_CONTR = 0;       //off iap  function     IAP_CMD   = 0;       //the command register so that the command registers are not deadOrder, this sentence can not be     iap_trig = 0;       //command trigger register, Make the command trigger register no trigger, this sentence can not     iap_addrh = 0;      //high eight-bit address clear 0     iap_addrl = 0;      //low eight-bit address clear 0} /********* *eeprom read a Byte subroutine ***********************/unsigned char byte_read (Unsigned int add)        //read a Byte, the call needs to open iap  function, the entry:dptr =  byte address, return:a =  Read bytes {     IAP_DATA = 0x00;            &NBSP;&NBSP;//IAP Data Register Clear 0    iap_contr = enable_isp;       //Open iap  function,  set flash  operation wait Time     IAP_CMD = 0x01;               //IAP/ISP/EEPROM  Byte Read command      iap_addrh =  (Unsigned char) (add>>8)     //set the destination cell address of the high 8  bit address      IAP_ADDRL =  (Unsigned char) (ADD&AMP;0XFF);     // Sets the low 8  bit address of the destination cell address      ea = 0;    iap_trig =  0x46;   //first Send  46h, and then send b9h  to the isp/iap  trigger register, each time need so &NBSP;&NBSP;&NBSP;&NBSP;IAP_ trig = 0xb9;   //,isp/iap  command is triggered immediately after delivery of the  B9h      _ Nop_ ();     ea = 1;    iap_disable ();  //Close iap  function,   Clear-related special function registers, so that the cpu  in a safe state,                     //once a continuous iap  operation is completed, it is recommended to turn off the iap  function, and do not need to close each      return  (iap_data);}   /************eeprom byte program subroutine **************************/void byte_program (Unsigned int  add, Unsigned char ch)   //byte programming, need to open iap  function before calling, ingress:dptr =  byte address, a=  Data {    iap_contr = enable_isp;        of the required programming bytes   //Open  IAP  function,  set flash  operation wait Time     IAP_CMD = 0x02;                  //iap/ isp/eeprom  byte Programming Command       IAP_ADDRH =  (Unsigned char) (add> &GT;8)     //set the high 8  address of the destination cell address     IAP_ADDRL =  (unsigned  char) (ADD&AMP;0XFF)     //set the low 8  bit address of the destination cell address      iap_data  = ch;                   //the data to be programmed is first sent to the iap_data  register     EA = 0;     iap_trig = 0x46;   //first Send  46h, and then send b9h  to the isp/iap  trigger register, each time need so     iap_trig =  0xb9;   //,isp/iap  command is triggered immediately after delivery  B9h      _nop_ ();     ea = 1;    iap_disable ();  //Close iap  function,  The cpu  is in a safe state by clearing the relevant special function registers,                     //once a continuous iap  operation is completed, it is recommended to turn off the iap  function, and do not need to close each time} /************* EEPROM Erase Sector Sub-program **************************/void sector_erase (Unsigned int add)         //Erase sector,  Ingress:dptr =  sector address {    iap_contr =  enable_isp;         //Open iap  function,  set flash  operation wait Time     IAP_CMD = 0x03;                  //iap/isp/eeprom  Sector Erase Command      IAP_ADDRH =  (Unsigned char) (add &GT;&GT;8)     //set the high 8  address of the destination cell address     IAP_ADDRL =  ( Unsigned char) (ADD&AMP;0XFF)     //set the low 8  address of the destination cell address       ea = 0;    iap_trig = 0x46;   //first Send  46h, then send b9h  To the isp/iap  trigger register, each time it needs to be so     iap_trig = 0xb9;   //sent out  b9h   Post,isp/iap  command is triggered immediately starting     _nop_ ();    ea = 1;     iap_disable ();      //off iap  function,  Clear related special function register, make cpu  In a safe State,                        //It is recommended to turn off the iap  function once a continuous iap  operation is complete, do not need to close}void main  (void) { Unsigned char mydata1  = 0xf0;unsigned char mydata2  = 0x0f;unsigned int   address1 = 0x2000;unsigned int  address2 = 0x21FF; Sector_erase (ADDRESS1);         //for data write Byte_program (ADDRESS1,MYDATA1) ; Byte_program (ADDRESS2,MYDATA2); P1 = byte_read (ADDRESS1);      //show Delay_ms (500); P1 = byte_read (Address2),      //show Delay_ms (//sector_erase);        //either erase Address1 or Address2sector_erase (address2);        p1 = byte_read (ADDRESS1);      //reads 0xffdelay_ms ( 500); P1 = byte_read (ADDRESS2);      //read 0xffdelay_ms (500);/* It can be proved that A and B belong to an address with a sector erase a or b  byte to read a again or b  has changed to 0xff*/while (1);}

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STC 89c51 Series EEPROM test procedure