W541E20X Datasheet, PDF (5/14 Pages) Winbond – 4 BIT FLASH EPROM MICROCONTROLLER

Preliminary W541E20X
PIN DESCRIPTION
SYMBOL
XIN
XOUT
RA0−RA2,
RA3 (DATA)
RB0−RB3
RC0−RC3
RD0−RD3
RE0/DOUT,
RE1/CLKO,
RE2/DIN,
RE3/CLKI
MFP
INT (MODE)¹
RES (VPP)¹
VDD
VSS
I/O
FUNCTION
I Input pin for oscillator.
Connected to crystal or resistor to generate system clock by code option.
External 10~20pF capacitor uses to get accurate freq in crystal mode.
O Output pin for oscillator.
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). When used as
output port, can provide high sink current for driving LED.
I/O Input/Output port.
Input/output mode specified by port mode 2 register (PM2). When used as
output port, can provide high sink current for driving LED.
I/O Input/Output port.
Input/output mode specified by port mode 4 register (PM4). Each pin has
an independent interrupt capability in input mode.
I/O Input/Output port.
Input/output mode specified by port mode 5 register (PM5).
I/O Special input/output port.
This port can be configured by software to act as the output of internal
port RT or the serial I/O port. When used as output port, can provide high
sink current for driving LED.
O Output pin only.
This pin can output modulating or nonmodulating frequency, or Timer 1
clock output specified by mode register 1 (MR1).
I External interrupt pin.
This pin must be tied to VDD through an external resistor. It is a low active
and floating input pin.
I System reset pin.
This pin must be tied to VDD through an external resistor when it is not
used to reset this chip. It is a low active and floating input pin.
I Positive power supply (+).
I Negative power supply (-).
Note: There are internal pull-high resistors in these pins of W741C20X.
Publication Release Date: June 2003
-5-
Revision A2