MC81F4204
April 24, 2012 Ver.1.41 119
21. SERIAL I/O INTERFACE
Serial I/O interface modules, SIO can interface with various types of external device that require serial
data transfer. The components of SIO function block are:
- 8-bit control register (SIOCR)
- Clock selector logic
- 8-bit data register (SIODAT)
- 8-bit pre-scaler register (SIOPS)
- 3-bit clock counter
- Serial data I/O pins (SI, SO)
- Serial clock pin (SCK)
The SIO module can transmit or receive 8-bit serial data at a frequency determined by its
corresponding control register settings. To ensure flexible data transmission rates, you can select
internal or external clock source.
Figure 21-1 SIO Block Diagram
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