44# wangkj
44b0手册里操作SIO好像只提到使用中断和DMA方式，怎么用查询方式？
To program the SIO modules, follow these basic steps:
1. Configure the I/O pins at port (SIOTXD, SIOCLK, SIORXD).
2. Set SIOCON register to properly configure the serial I/O module.
3. For interrupt generation, set the serial I/O interrupt enable bit and refer the interrupt controller to 1.
4. If you want to transmit data to the serial buffer, write data to SIODAT.
5. For receiving/transmitting, set SIOCON[3] to 1 to start the shift operation.
6. When the shift operation (transmit/receive) is completed, the SIO interrupt is requested and SIODAT has the
received data or dummy data.
7. go to step 4 |
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