W79E217A Datasheet, PDF (10/207 Pages) Winbond – 8-bit Microcontroller

Preliminary W79E217A Data Sheet
PIN DESCRIPTION, continued
SYMBOL
TYPE
INITIAL
STATE
DESCRIPTIONS
P4.0-P4.3 I/O S H High
PORT 4: 4-bit multipurpose programmable I/O port with alternate
functions. The Port 4 has four different operation modes.
P4.0, STADC
P4.1, T2EX, IC2
P4.2
P4.3
P5.0-P5.1 I/O S
Tri-
state
P5.2-P5.7 I/O S H High
PORT 5: 8-bit, bit-directional I/O port. This port is not bit
addressable. The alternate functions are described below:
P5.0, PWM6
P5.1, PWM7
P5[7:2] = SEG [15:10]
I/O
P6.0-P6.7 _{D H}
High
PORT 6: 8-bit, bit-directional I/O port. This port is not bit
addressable.
P6[7:0] = SEG [23:16]
P7.0-P7.7 I/O S H High
PORT 7: 8-bit, bit-directional I/O port. This port is not bit
addressable.
P7[7:0] = SEG [31:24]
SEG0-
SEG9
O
LCD segment outputs.
Low
Can also be used as DC output ports specified by code option.
DH1, DH2 I
-
Capacitor input for LCD driver.
LCD common outputs.
1/3 Duty 1/4 Duty
COM0-
COM3
O
COM0 Used
Used
Low
COM1 Used
Used
COM2 Used
Used
COM3 Not Used Used
The LCD alternating frequency can be selected by code option.
Note ：TYPE I: input, O: output, I/O: bi-directional, H: pull-high, L: pull-low, D: open drain S: Schmitt Trigger
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Publication Release Date: December 14, 2007
Revision A3.0