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CHAPTER 19 SERIAL INTERFACE CHANNEL 2
(2) 3-wire Serial I/O ModeTable 19-2. Serial Interface Channel 2 Operating Mode Settings(1) Operation Stop Mode
P72/SCK2
/ASCK Pin
Functions
P71/SO2
/TxD Pin
Functions
P70/SI2
/RxD Pin
Functions
Shift
Clock
Start
Bit
TXE RXE SCK CSIE2 CSIM22 CSCK
PM70 P70 PM71 P71 PM72 P72
ASIM CSIM2
1
0
1
0
1
1
0 0
0
0
0
0
0
0
0
0
×
Note 1
×
Note 1
011
1
×
×
LSB
External
clock
Internal
clock
External
clock
Internal
clock
External
clock
Internal
clock
P70 TxD
(CMOS
output)
ASCK input
P72
ASCK input
P72
ASCK input
P72
P71
Note 1
×
Note
1
×
1
0
1
0
1
1
1
×
×
×
Note 1
Note
1
×RxD
Note
1
×
Note
1
×
011×TxD
(CMOS
output)
Note
1
×
Note
1
×
Other than above Setting prohibited
P72/SCK2
/ASCK Pin
Functions
P71/SO2
/TxD Pin
Functions
P70/SI2
/RxD Pin
Functions
Shift
Clock
Start
Bit
TXE RXE SCK CSIE2 CSIM22 CSCK
PM70 P70 PM71 P71 PM72 P72
ASIM CSIM2
000 1
1
0
1
1
1
1
Note 2 ×Note 2 0101 MSB
LSB
Internal
clock
SI2
SI2
SO2
(CMOS
output)
SCK2 output
Other than above Setting prohibited
Note 2
Note 2
SO2
(CMOS
output)
P72/SCK2
/ASCK Pin
Functions
P71/SO2
/TxD Pin
Functions
P70/SI2
/RxD Pin
Functions
Shift
Clock
Start
Bit
TXE RXE SCK CSIE2 CSIM22 CSCK
PM70 P70 PM71 P71 PM72 P72
ASIM CSIM2
0 0 ×0×××
Note 1
×
Note 1
×
Note 1
×
Note 1
×
Note 1
×
Note 1
— — P70 P71 P72
Other than above Setting prohibited
(3) Asynchronous Serial Interface ModeNotes 1. Can be used freely as port function.2. Can be used as P70 (CMOS input/output) when only transmitter is used.Remark ×: Don't carePMXX : Port Mode RegisterPXX : Port Output Latch