W79E225A Datasheet, PDF (11/200 Pages) Winbond – 8-bit Microcontroller

Preliminary W79E225A/227A Data Sheet
PIN DESCRIPTION, continued
SYMBOL
TYPE
INITIAL
STATE
DESCRIPTIONS
P1.0−P1.7 I/O S H High
PORT 1: 8-bit, bi-directional I/O port with internal pull-ups. The
ports have alternate functions which are described below:
P1.0, ADC0, T2
P1.1, ADC1, BRAKE
P1.2, ADC2, RXD1
P1.3, ADC3, TXD1
P1.4, ADC4
P1.5, ADC5
P1.6, ADC6
P1.7, ADC7
P2.0-P2.5 I/O S
P2.6-P2.7 I/O D
PORT 2: 8-bit, bi-directional I/O port. This port also provides the
upper address bits for accesses to external memory. P2.6 to P2.7
can be software configured as I2C serial ports. P2.0 to P2.5 also
provides PWM0 to PWM5 outputs.
P2.0, A8, PWM0
Tri-state ^{P2.1, A9, PWM1}
P2.2, A10, PWM2
P2.3, A11, PWM3
P2.4, A12, PWM4
P2.5, A13, PWM5
P2.6, A14, SCL
P2.7, A15, SDA
Note:
High-Z
P2.6 and P2.7 are permanent open drain pins. When access to
external memory beyond 16K region, user requires to add
external pull-up registers (up to 2Kohm) on these pins. This
will result in slight increase in current consumption.
P3.0-P3.7 I/O S H High
PORT 3: 8-bit, bi-directional I/O port with internal pull-ups. The
ports have alternate functions which are described below:
P3.0, RXD
P3.1, TXD
P3.2, /INT0
P3.3, /INT1
P3.4, T0, IC0, QEA
P3.5, T1, IC1, QEB
P3.6, /WR
P3.7, /RD
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Publication Release Date: December 14, 2007
Revision A2.0