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CHAPTER 17 Serial I/O
17.1 Overview of Serial I/O
The serial I/O can automatically transfer 8-bit serial data and can select external
initiation, multiple shift clock, and transfer interval time.
■ Feature of Serial I/O
• 8-bit serial data can be transferred using clock synchronization.
• Automatic transfer of up to 128 bytes
• External initiation by ship select input (XCS)
• 4-type shift clock (inner: 3, outer: 1) can be selected
• Enable/disable of transition interval time can be selected
■ Block Diagram of Serial I/O
Figure 17.1-1 Block diagram of serial I/O
Internal Bus
SIF ICLR SIE CSAF ACLR
DIR CSE ST
BMTransfer Byte Count Register
Transfer Byte Count Register
Control Unit
IC1
IC0
SC2
SC1
SC0
Compare
Address offset
Shift Register
Clock
Control
Unit
XCS
SCK
2
3
/fch
2
4
/fch
2
5
/fch
External
SO
SI
Port
CTL
IRQx
R
BMOD
RAM
M
P
X
SHIFT-CLOCK