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9.4.2 3-wire serial I/O mode
The 3-wire serial I/O mode is useful for connection of peripheral I/Os and display controllers, etc., which
incorporate a conventional synchronous serial interface, such as the 75XL Series, 78K Series, 17K Series, etc.
Communication is performed using three lines: the serial clock (SCK10), serial output (SO10), and serial input
(SI10).
(1) Register setting
3-wire serial I/O mode settings are performed using serial operating mode register 10 (CSIM10).
(a) Serial operation mode register 10 (CSIM10)
CSIM10 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets CSIM10 to 00H.
Symbol
<7>
6
CSIM10
CSIE10
0
CSIE10
0
Operation disabled
1
Operation enabled
TPS100
0
f
/2
2
X
1
f
/2
3
X
DIR10
0
MSB
LSB
1
CSCK10
0
Clock input to SCK10 pin from external
1
Internal clock selected by TPS100
Caution
Bits 0, 3, 5, and 6 must be set to 0.
160
CHAPTER 9
SERIAL INTERFACE 10
5
4
3
2
1
0
TPS100
0
DIR10 CSCK10
Operation control in 3-wire serial I/O mode
Count clock selection when operation enabled in 3-wire serial I/O mode
Start bit specification
Clock selection in 3-wire serial I/O mode
User's Manual U12978EJ3V0UD
0
Address
After reset
0
FF72H
00H
R/W
R/W
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