CHAPTER 9 SERIAL INTERFACE 00
User's Manual U11919EJ3V0UM00
145
9.4.3 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 75X/XL Series, 78K Series, 17K Series, etc.
Communication is performed using three lines: the serial clock (SCK0), serial output (SO0), and serial input
(SI0).
(1)
Register setting
3-wire serial I/O mode settings are performed using serial operation mode register 00 (CSIM00),
asynchronous serial interface mode register 00 (ASIM00), and baud rate generator control register 00
(BRGC00).
(a) Serial operation mode register 00 (CSIM00)
CSIM00 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input clears CSIM00 to 00H.
CSIE00
0
1
Operation Control in 3-Wire Serial I/O Mode
CSIE00
0
0
0
0
DIR00
CSCK00
0
CSIM00
Symbol
Address
After Reset
R/W
FF72H
00H
R/W
<7>
6
5
4
3
2
1
0
Operation stop
Operation enable
DIR00
0
1
Start Bit Specification
MSB
LSB
CSCK00
0
1
Clock Selection in 3-Wire Serial I/O Mode
Input clock to SCK0 pin from external
Dedicated baud rate generator output
Caution
Be sure to set bit 0 and bits 3 to 6 to 0.
Содержание mPD789026 Subseries
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