參數(shù)資料
型號: W741C250
英文描述: 4-Bit Microcontroller
中文描述: 4位微控制器
文件頁數(shù): 4/88頁
文件大?。?/td> 449K
代理商: W741C250
W741C250
- 4 -
PIN DESCRIPTION
SYMBOL
I/O
FUNCTION
XIN
I
Input pin for oscillator.
Connected to crystal or resistor to generate system clock by code option.
XOUT
O
Output pin for oscillator.
Connected to crystal or resistor to generate system clock by code option.
RA0
RA3
I/O
Input/Output port.
Input/output mode specified by port mode 1 register (PM1).
RB0
RB3
I/O
Input/Output port.
Input/output mode specified by port mode 2 register (PM2).
RC0
RC3
I
4-bit port for input only.
Each pin has an independent interrupt capability.
RD0
RD3
RE0
RE3
I
4-bit port for input only.
O
Output port only.
This port provides high sink current to drive LED.
MFP
O
Output pin only.
This pin can output modulating or nonmodulating frequency, or Timer 1
clock output specified by mode register 1 (MR1).
INT
I
External interrupt pin with pull-high resistor.
RES
I
System reset pin with pull-high resistor.
SEG0
SEG23
O
LCD segment output pins.
Also can be used as DC output ports specified by code option.
COM0
COM3
O
LCD common signal output pins.
Static
COM0
COM1
COM2
COM3
Used
Not Used
1/2 Duty
Not Used
Not Used
Not Used
Not Used
1/3 Duty
Not Used
1/4 Duty
Used
Used
Used
Used
Used
Used
Used
Used
Used
The LCD alternating frequency can be selected by code option.
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