NEC uPD78P078 - Manual (Page 463)

463
CHAPTER 20 SERIAL INTERFACE CHANNEL 2
Table 20-2. Serial Interface Channel 2 Operating Mode Settings
(1) Operation Stop Mode
(2) 3-wire Serial I/O Mode
(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 x : Don’t care
PMxx : Port mode register
Pxx : Port output latch
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 1
1
0
1
0
1
0
1
1 Note 2 x Note 2 0 1 1
0
1
0
x
1
x
1
MSB
LSB
External
clock
Internal
clock
External
clock
Internal
clock
SI2 SO2
(CMOS
output)
SCK2 input
SCK2 output
SCK2 input
SCK2 output
Other than above Setting prohibited
Note 2
SI2
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
1
0
1
0
1
1
0 0
0
0
0
0
0
0
0
0
x
Note 1
x
Note 1
0 1 1
1
x
x
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 x x 1
0
1
0
1
1
1
x
x
x Note 1 Note 1 x RxD
Note 1
Note 1
x Note 1 x
0 1 1 x TxD
(CMOS
output)
Note 1 x Note 1 x
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 0 x 0 x x x Note 1 x Note 1 x Note 1 x Note 1 x Note 1 x Note 1 — — P70 P71 P72
Other than above Setting prohibited