Familiar with related circuit, control I/O port, and configuration parameters, LED, photosensitive, 74ls164 digital tube

1. Master the basic working circuit of ZigBee Wireless module.

2, the above chip with the emulator connection needs 5 wires, power, ground, reset, P2_1, p2_2.

Output configuration: A, the first to make the corresponding IO port in the normal IO port mode, non-on-chip peripheral mode, B, so that the normal IO port in the output state, non-input state, C, directly to the corresponding IO port assignment, the corresponding value is output.

The input or output status of all IO ports is determined by P0dir, P1dir, P2dir.

Input configuration:

Familiar with related circuit, control I/O port, and configuration parameters, LED, photosensitive, 74ls164 digital tube