k64 datasheet学习笔记10---Signal Multiplexing and Signal Descriptions

1.前言

本文主要描述多功能引脚相关的内容，包括5个32位的引脚的端口，每个32pin端口被指定一个中断

2.Signal Multiplexing Integration

3. Port control and interrupt summary

4. PCRn reset values for port A

PCRn bit reset values for port A are 1 for the following bits:
• For PCR0: bits 1, 6, 8, 9, and 10.
• For PCR1 to PCR4: bits 0, 1, 6, 8, 9, and 10.
• For PCR5 : bits 0, 1, and 6.
All other PCRn bit reset values for port A are 0

5.Clock gating

The clock to the port control module can be gated on and off using the SCGC5[PORTx] bits in the SIM module.

6. Signal multiplexing constraints

1. A given peripheral function must be assigned to a maximum of one package pin. Do
not program the same function to more than one pin.
2. To ensure the best signal timing for a given peripheral's interface, choose the pins in
closest proximity to each other.