Serial Interface Channel 2 Operating Mode Settings - NEC PD78076 User Manual

Table 20-2. Serial Interface Channel 2 Operating Mode Settings
(1) Operation Stop Mode
ASIM CSIM2
TXE RXE SCK CSIE2 CSIM22 CSCK
0 0 x 0 x
Other than above
(2) 3-wire Serial I/O Mode
ASIM CSIM2
TXE RXE SCK CSIE2 CSIM22 CSCK
0 0 0 1 0
1 1
Other than above
(3) Asynchronous Serial Interface Mode
ASIM CSIM2
TXE RXE SCK CSIE2 CSIM22 CSCK
1 0 0 0 0
1
0 1 0 0 0
1
1 1 0 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 x : Don't care
PMxx : Port mode register
Pxx : Port output latch
CHAPTER 20 SERIAL INTERFACE CHANNEL 2
PM70 P70 PM71 P71 PM72 P72
Note 1 Note 1 Note 1 Note 1
x x x x x
PM70 P70 PM71 P71 PM72 P72
Note 2 Note 2
0 1 x 0
1
0
1
PM70 P70 PM71 P71 PM72 P72
Note 1 Note 1
0 x x
0
Note 1 Note 1
0
1 x x x
0 1 x 0
Other than above
Start Shift
Bit Clock
Note 1 Note 1
x x — —
Start Shift
Bit Clock
1 1 x MSB External
clock
0 1 Internal
clock
1
x LSB External
clock
0
1 Internal
clock
Start Shift
Bit Clock
1 1 x LSB External
clock
Note 1 Note 1
Internal
x x
clock
1 x External
clock
Note 1 Note 1
Internal
x x
clock
1 1 x External
clock
Note 1 Note 1
x x Internal
clock
P72/SCK2
P70/SI2 P71/SO2
/ASCK Pin
/RxD Pin /TxD Pin
Functions
Functions Functions
P70 P71 P72
Setting prohibited
P72/SCK2
P70/SI2 P71/SO2
/ASCK Pin
/RxD Pin /TxD Pin
Functions
Functions Functions
Note 2
SI2 SO2 SCK2 input
(CMOS
output)
SCK2 output
Note 2
SO2
SI2 SCK2 input
(CMOS
output)
SCK2 output
Setting prohibited
P72/SCK2
P70/SI2 P71/SO2
/ASCK Pin
/RxD Pin /TxD Pin
Functions Functions Functions
TxD ASCK input
P70
(CMOS
output)
P72
ASCK input
RxD P71
P72
TxD
ASCK input
(CMOS
output)
P72
Setting prohibited
463