Serial Interface Channel 2 Operating Mode Settings - NEC PD78081(A) User Manual

Table 11-2. Serial Interface Channel 2 Operating Mode Settings
(1) Operation Stop Mode
ASIM
TXE RXE SCK CSIE2 CSIM22 CSCK
0 0 x 0
(2) 3-wire Serial I/O Mode
ASIM CSIM2
TXE RXE SCK CSIE2 CSIM22 CSCK
0 0 0 1
1
(3) Asynchronous Serial Interface Mode
ASIM
TXE RXE SCK CSIE2 CSIM22 CSCK
1 0 0 0
1
0 1 0 0
1
1 1 0 0
1
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
PM : Port mode register
P : Port output latch
142
CHAPTER 11 SERIAL INTERFACE CHANNEL 2
CSIM2 PM70 P70 PM71 P71 PM72 P72
Note1 Note1
x x x x
Other than above
PM70 P70 PM71 P71 PM72 P72
Note2 Note2
0 0 1 x
1
1 0
1
Other than above
CSIM2 PM70 P70 PM71 P71 PM72 P72
Note1 Note1
0 0 x x
0 0
1 x
0 0 1 x
Other than above
Start
Bit
Note1 Note1 Note1
Note1
x x x x —
Start
Bit
1 1 x MSB
0
0 1
1 x LSB
0 1
Start
Bit
1 1
0 x LSB External
Note1
Note1
x
x
Note1 Note1
1
x
x x
Note1 Note1
x x
0 1 1 x
Note1 Note1
x x
Shift
P70/SI2 P71/SO2
Clock
/RxD Pin /TxD Pin
Functions Functions
— P70 P71
Setting prohibited
Shift
P70/SI2 P71/SO2
Clock
/RxD Pin /TxD Pin
Functions Functions
Note2
External SI2 SO2
clock (CMOS
output)
Internal
clock
External
clock
Internal
clock
Setting prohibited
Shift
P70/SI2 P71/SO2
Clock
/RxD Pin /TxD Pin
Functions Functions
TxD
P70
clock (CMOS
output)
Internal
clock
External
RxD P71
clock
Internal
clock
TxD
External
(CMOS
clock
output)
Internal
clock
Setting prohibited
P72/SCK2
/ASCK Pin
Functions
P72
P72/SCK2
/ASCK Pin
Functions
SCK2 input
SCK2 output
SCK2 input
SCK2 output
P72/SCK2
/ASCK Pin
Functions
ASCK input
P72
ASCK input
P72
ASCK input
P72