NEC uPD78056Y - Manual (Page 446)

446
CHAPTER 19 SERIAL INTERFACE CHANNEL 2
Table 19-2. 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
×
: Don't care
PM
××
: Port mode register
P
××
: 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 Ч 0 Ч Ч Ч Note1 × Note1 × Note1 × Note1 × Note1 × Note1 — — P70 P71 P72
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 0 1
1
0
1
1
1
1 Note2 × Note2
0 1 0 1 MSB
LSB
Internal
clock SI2
SI2
SO2
(CMOS
output) SCK2 output
Other than above Setting prohibited
Note2
Note2
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
× Note1 × Note1 0 1 1
1
Ч
Ч
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
Note1 × Note1 Ч 1
0
1
0
1
1
1
Ч
Ч
Ч Note1 Note1 × RxD
Note1 × Note1 Ч
0 1 1 Ч TxD
(CMOS
output)
Note1 × Note1 ×
Other than above Setting prohibited