W541E Datasheet, PDF (7/13 Pages) Winbond – 4BIT MICROCONTROLLER, 4K ×16 ROM, 256 ×4 RAM 128 -DOT LCD

W541E/C480 DATA SHEET
3.3 PAD DESCRIPTION
SYMBOL
XIN1
XOUT1
XIN2
XOUT2
RA0 −RA3
RB0 −RB3
RC0 −RC3
I/O
FUNCTION
Input pin for oscillator.
I
Connected to crystal or resistor to generate system clock by code option.
External 15~20pF 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
Input pin for sub-oscillator. Connected to a 32.768 KHz crystal. External
15~20pF capacitor uses to get accurate freq in crystal mode..
O
oscillator. Connected Output pin for sub to a 32.768 KHz crystal. 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.
RD0 −RD3
RE0 −RE3
/INT
MFP
I
4-bit port for input only.
O
Output port only.
This port provides high sink current to drive LEDs.
I
External interrupt pin with pull-high resistor. This pin is bonding option for
the W541C250 body. Only for W541E480.
Output pin only.
O
This pin can output modulating or nonmodulating frequency, or Timer 1
clock output specified by mode register 1 (MR1).
RES
I
SEG0−SEG31 O
System reset pin with pull-high resistor.
LCD segment output pins.
Can also be used as DC output ports specified by code option.
LCD common signal output pins.
COM0−COM3 O
DH1, DH2
I
Static 1/2 Duty 1/3 Duty 1/4 Duty
COM0 Used
Used
Used
Used
COM1 Not Used Used
Used
Used
COM2 Not Used Not Used Used
Used
COM3 Not Used Not Used Not Used Used
The LCD alternating frequency can be selected by code option.
Connection terminals for voltage doubler (halver) capacitor.
Publication Release Date: June 8, 2007
-7-
Revision A2