UPD78F9418A NEC, UPD78F9418A Datasheet - Page 178

• Manufacturer Part Number: UPD78F9418A
• Description: (UPD7894xxA) 8-Bit Single Chip Microcontrollers
• Manufacturer: NEC

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178
(1)
(2)
(3)
Notes 1. Can be used as port function.
Remark
TXE00
TXE00
TXE00 RXE00 CSIE00
ASIM00
ASIM00
Other than above
ASIM00
Other than above
Other than above
0
1
0
1
0
Operation stopped mode
RXE00
Asynchronous serial interface mode
3-wire serial I/O mode
RXE00
0
1
1
0
0
2. If used only for transmission, can be used as P22 (CMOS I/O).
CSIE00
CSIE00
x: Don’t care
0
0
0
0
1
1
CSIM00
CSIM00
CSIM00
DIR00
DIR00
DIR00 CSCK00
0
0
0
x
0
1
CSCK00
CSCK00
x
0
0
0
0
1
0
1
Table 13-2. Operation Mode Settings of Serial Interface 00
PM22
x
PM22
x
1
PM22 P22 PM21 P21 PM20 P20 Start
Note 1
Note 1
Note 2
1
1
x
x
x
P22
P22
Note 1
Note 1
Note 2
x
x
x
PM21
PM21
x
Note 1
Note 1
CHAPTER 13 SERIAL INTERFACE 00
0
0
0
x
x
P21
P21
Note 1
Note 1
1
1
1
User’s Manual U13952EJ3V0UD
x
PM20
x
PM20
x
x
Note 1
Note 1
Note 1
Note 1
1
1
1
1
0
1
0
x
x
x
x
P20
P20
Note 1
Note 1
Note 1
Note 1
x
x
x
x
1
x
1
Start
Bit
Start
Bit
Bit
MSB
LSB
LSB
Setting prohibited
Setting prohibited
Setting prohibited
—
Shift
Clock
Shift
Clock
Shift
Clock
External
clock
Internal
clock
External
clock
External
clock
Internal
clock
External
clock
Internal
clock
Internal
clock
External
clock
Internal
clock
—
P22/SI/RxD
Pin Function
P22/SI/RxD
P22/SI/RxD
Pin Function
Pin Function
P22
P22
RxD
SI
Note 2
(CMOS output)
P21/SO/TxD
Pin Function
(CMOS output)
Pin Function
P21/SO/TxD
Pin Function
TxD
TxD
P21/SO/TxD
P21
P21
SO
(CMOS output)
Pin Function
Pin Function
Pin Function
P20/SCK/ASCK
P20
P20/SCK/ASCK
P20/SCK/ASCK
SCK input
SCK output
SCK input
SCK output
ASCK input
P20
ASCK input
P20
ASCK input
P20