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CHAPTER 19 SERIAL INTERFACE CHANNEL 2
(2) 3-wire Serial I/O Mode
Table 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
0
11
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
0 00 1
1
0
1
1
1
1
Note 2
×
Note 2
0
10
1 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 Mode
Notes 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 care
PMXX : Port Mode Register
PXX : Port Output Latch