CHAPTER 9 SERIAL INTERFACE 00
User's Manual U11919EJ3V0UM00
127
Table 9-2. Serial Interface 00 Operating Mode Settings
(1)
Operation stop mode
ASIM00
CSIM00
TXE00 RXE00 CSIE00
DIR00
CSCK00
PM22
P22
PM21
P21
PM20
P20
Start
Bit
Shift
Clock
P22/SI0/RxD
Pin Function
P21/SO0/TxD
Pin Function
P20/SCK0/ASCK
Pin Function
0
0
0
×
×
×
Note 1
×
Note 1
×
Note 1
×
Note 1
×
Note 1
×
Note 1
−
−
P22
P21
P20
Other than above
Setting prohibited
(2)
3-wire serial I/O mode
ASIM00
CSIM00
TXE00 RXE00 CSIE00
DIR00
CSCK00
PM22
P22
PM21
P21
PM20
P20
Start
Bit
Shift
Clock
P22/SI0/RxD
Pin Function
P21/SO0/TxD
Pin Function
P20/SCK0/ASCK
Pin Function
0
1
×
External
clock
SCK0 input
1
0
1
0
1
MSB
Internal
clock
SCK0 output
0
1
×
External
clock
SCK0 input
0
0
1
1
1
1
Note 2
×
Note 2
0
1
0
1
LSB
Internal
clock
SI0
Note 2
SO0
(CMOS output)
SCK0 output
Other than above
Setting prohibited
(3)
Asynchronous serial interface mode
ASIM00
CSIM00
TXE00 RXE00 CSIE00
DIR00
CSCK00
PM22
P22
PM21
P21
PM20
P20
Start
Bit
Shift
Clock
P22/SI0/RxD
Pin Function
P21/SO0/TxD
Pin Function
P20/SCK0/ASCK
Pin Function
1
×
External
clock
ASCK input
1
0
0
0
0
×
Note 1
×
Note 1
0
1
×
Note 1
×
Note 1
Internal
clock
P22
TxD
(CMOS output)
P20
1
×
External
clock
ASCK input
0
1
0
0
0
1
×
×
Note 1
×
Note 1
×
Note 1
×
Note 1
Internal
clock
P21
P20
1
×
External
clock
ASCK input
1
1
0
0
0
1
×
0
1
×
Note 1
×
Note 1
LSB
Internal
clock
RxD
TxD
(CMOS output)
P20
Other than above
Setting prohibited
Notes 1. Can be used as port function.
2. If used only for transmission, can be used as P22 (CMOS input/output).
Remark
×
: Don't care.
Содержание mPD789026 Subseries
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