W742S81A Datasheet, PDF (4/47 Pages) Winbond – 4 BIT MICROCONTROLLER

W742S81A
4. PIN DESCRIPTION
SYMBOL
XIN2
XOUT2
XIN1
XOUT1
RA0-RA3
RB0-RB3
RC0-RC3
RD0-RD3
RE0-RE3
RF0-RF3
MFP
DTMF
RES
SEG0-SEG39
COM0-
COM3
DH1, DH2
VDD1
VDD2
VDD
VSS
VPP
MODE
DATA
I/O
FUNCTION
I Input pin for sub-oscillator.
Connected to 32.768 KHz crystal only.
O Output pin for sub-oscillator with internal oscillation capacitor. Connected to 32.768 KHz
crystal only.
I Input pin for main-oscillator.
Connected to 3.58MHz or 400KHz crystal or RC to generate system clock.
O Output pin for main-oscillator.
Connected to 3.58MHz or 400KHz crystal or RC to generate system clock.
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.
I/O Input/Output port.
Input/output mode specified by port mode 5 register (PM5).
O Output port only. With high sink current capacity for the LED application.
O Output port only.
Output pin only.
O This pin can output modulating or nonmodulating frequency, or Timer 1 specified frequency.
It can be selected by bit 0 of BUZCR (BUZCR.0).
O This pin can output dual-tone multifrequency signal for dialling.
I System reset pin with pull-high resistor.
O LCD segment output pins.
O LCD common signal output pins.
The LCD alternating frequency can be selected by code option.
I Connection terminals for voltage doubler (halver) capacitor.
I Positive (+) supply voltage terminal.
Refer to Functional Description.
I Positive power supply (+).
I Negative power supply (-).
I Voltage control pin for the electrical erasable EPROM programming, erasing and verifying.
This pin has the built-in pull-low resistor.
I This pin can be used as mode selection control; data read/write clock;
program/erase control or address counter control in the electrical erasable EPROM erasing,
programming or verifying mode. This pin has the built-in pull-low resistor.
I/O Data I/O pin with the built-in pull-low resistor.
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