Introduction - If you have any usage issues, please Google them yourself
PIC16887A a two-machine communications microcontroller, two asynchronous serial communication interface connected to Microcontroller way: RX and TX cross-docking, the left side of the microcontroller U1, S1 each key is pressed to send a number of bytes, starting from 0x20 to send, each send a data, this number plus 1. send the output port D at the same time. Right of the microcontroller U2 to receive state, the use of interrupt and, if receive interrupt, the interrupt will be received directly on the number of output port D