參數(shù)資料
型號: μPD789121
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8 位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數(shù): 11/48頁
文件大小: 220K
代理商: ΜPD789121
Preliminary Product Information
11
μ
PD789121, 789122, 789124
3.2
Non-Port Pins
Pin name
I/O
Function
When reset
Also used as
INTP0
Input
Input
P23/CPT20/SS20
INTP1
P24/TO80/TO20
INTP2
P25/TI80
SI20
Input
Serial data input to serial interface
Input
P22/RxD20
SO20
Output
Serial data output from serial interface
Input
P21/TxD20
SCK20
I/O
Serial clock input/output for serial interface
Input
P20/ASCK20
ASCK20
Input
Serial clock input to asynchronous serial interface
Input
P20/SCK20
SS20
Input
Chip select input to serial interface
Input
P23/CPT20/INTP0
RxD20
Input
Serial data input to asynchronous serial interface
Input
P22/SI20
TxD20
Output
Serial data output from asynchronous serial interface
Input
P21/SO20
TI80
Input
External count clock input to 8-bit timer (TM80)
Input
P25/INTP2
TO80
Output
8-bit timer (TM80) output
Input
P24/INTP1/TO20
TO20
Output
16-bit timer (TM20) output
Input
P24/INTP1/TO80
CPT20
Input
Capture edge input
Input
P23/INTP0/SS20
ANI0-ANI3
Input
A/D converter analog input
Input
P60-P63
AV
SS
-
A/D converter ground potential
-
-
AV
DD
-
A/D converter analog power supply
-
-
CL1
Input
-
-
CL2
-
-
-
RESET
Input
System reset input
Input
-
V
DD
-
Positive supply voltage
-
-
V
SS
-
Ground potential
-
-
IC
-
Internally connected directly to the V
SS
pin
-
-
External interrupt input for which effective edges
(rising and/or falling edges) can be specified
Connected to resistor (R) or capacitor (C) for main system clock
oscillation
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