CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U13850EJ4V0UM
339
10.5.3 Operations
CSI4 has the following two operation modes.
•
Operation stop mode
•
3-wire variable-length serial I/O mode
(1) Operation stop mode
In this mode serial transfers are not performed and therefore power consumption can be reduced.
When in operation stop mode, SI4, SO4, and SCK4 can be used as normal I/O ports.
(a) Register settings
Operation stop mode is set via CSIE4 bit of variable-length serial control register 4 (CSIM4). While CSIE4 =
0 (SIO4 operation stop state), the pins connected to SI4, SO4, or SCK4 function as port pins.
Figure 10-54. CSIM4 Setting (Operation Stop Mode)
After reset: 00H
R/W
Address: FFFFF2E2H
7
6
5
4
3
2
1
0
CSIM4
CSIE4
0
0
0
0
MODE4
0
SCL4
SIO4 operation enable/disable specification
CSIE4
Shift register operation
Serial counter
Port
0
Operation disabled
Clear
Port function
Содержание MPD703030A
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