W541C240 Datasheet, PDF (6/10 Pages) Winbond – 4-BIT MICROCONTROLLER

W541C240
5. PIN DESCRIPTION
SYMBOL
XIN
XOUT
RA0−RA3
RB0−RB3
RC0−RC3
MFP
RES
SEG0−SEG23
I/O
FUNCTION
Input pin for oscillator.
I Connected to crystal or resistor to generate system clock by code option.
External 10~20pF capacitor uses to get accurate freq in crystal mode..
Output pin for oscillator.
O _{Connected to crystal or resistor to generate system clock by code option.}
20pF capacitor is built in internal for crystal mode..
I/O
Input/Output port.
Input/output mode specified by port mode 1 register (PM1).
I/O
Input/Output port.
Input/output mode specified by port mode 2 register (PM2).
I
4-bit port for input only.
Each pin has an independent interrupt capability.
Output pin only.
O
This pin can output modulating or nonmodulating frequency, or Timer 1
clock output specified by mode register 1 (MR1).
I System reset pin with pull-high resistor.
O LCD segment output pins.
LCD common signal output pins.
COM0−COM3 O
COM0
COM1
COM2
COM3
Static
Used
Not Used
Not Used
Not Used
1/2 Duty
Used
Used
Not Used
Not Used
1/3 Duty
Used
Used
Used
Not Used
1/4 Duty
Used
Used
Used
Used
The LCD alternating frequency can be selected by code option.
DH1, DH2
VDD1, VDD2,
VDD3
VDD
VSS
I Connection terminals for voltage doubler (halver) capacitor.
Positive (+) supply voltage terminal.
I
Refer to Functional Description.
I Positive power supply (+).
I Negative power supply (-).
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