Table of Contents
Advertisement
12
12.1 Outline of Serial I/O
The 32170 contains a total of six channels of serial I/O-SIO0, SIO1, SIO2, SIO3, SIO4, and SIO5.
SIO0, SIO1, SIO4, and SIO5 can be selected between CSIO mode (clock-synchronous serial I/O)
and UART mode (asynchronous serial I/O). SIO2 and SIO3 are UART mode only.
• CSIO mode (clock-synchronous serial I/O)
Communication is performed synchronously with transfer clock, using the same clock on
both transmit and receive sides. The transfer data is 8 bits long (fixed).
• UART mode (asynchronous serial I/O)
Communication is performed asynchronously. The transfer data length can be selected
from 7 bits, 8 bits, and 9 bits.
Serial I/O0-3 each have a transmit DMA transfer and a receive DMA transfer request. These
transfer requests, when combined with the internal DMAC, allow serial communication to be
performed at high speed, as well as reduce the CPU burdens imposed by data communication.
Serial I/O is outlined in the pages to follow.
12-2
SERIAL I/O
12.1 Outline of Serial I/O
Ver.0.10
Advertisement
Table of Contents
