W921E400A Datasheet, PDF (6/53 Pages) Winbond – 4-BIT MICROCONTROLLER

W921E400A/W921C400
4. PIN DESCRIPTION
SYMBOL
I/O
FUNCTION
OSCI
I
Main oscillator input pin with internal capacitor
OSCO
P2.0 to P2.1
O
Main oscillator output pin
I/O^V
I/O port 2 with large sink current
P3.0/ANI0 to
I/O
I/O port 3 or analog input (ANI0 to ANI3) pins
P3.3/ANI3
P4.2
P4.3/INT0
I/O^K I/O pin P4.2 or the input pin of interrupt port
I/O^K I/O pin P4.3 or INT0 input pin
P5.1/TM2
I/O
I/O pin P5.1 or the controlled pin of timer2
P6.0/WDATA
I/O^K
I/O pin P6.0 or the data output pin of serial interface
P6.1/WCLK
I/O^K I/O pin P6.1 or the clock I/O pin of WDATA
P6.2/RDATA
P6.3/RCLK
PA.0 to PA.3
PB.0 to PB.3
I/OK I/O pin P6.2 or the data input pin of serial interface
I/O^K I/O pin P6.3 or the clock I/O pin of RDATA
I/O^K I/O port A with wake up stop mode function
I/O^K I/O port B with wake up stop mode function
DTMF
O
Dual tone multi-frequency output pin
BTG
O
Beep tone generator output pin
RESET
I
Reset input pin with low active
VDD
I
Positive power supply input pin
VSS
I
Negative power supply input pin
Notes:
V open drain option by software
K open drain and pull high resistor option by software
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