W77E058A Datasheet, PDF (6/87 Pages) Winbond – 8-BIT MICROCONTROLLER

W77E058A
Pin Description, continued
SYMBOL
TYPE
DESCRIPTIONS
PORT 3: Port 3 is a bi-directional I/O port with internal pull-ups. All bits have
alternate functions, which are described below:
RXD(P3.0) : Serial Port 0 input
TXD(P3.1) : Serial Port 0 output
P3.0−P3.7
INT0 (P3.2) : External Interrupt 0
I/O _{INT1(P3.3) : External Interrupt 1}
T0(P3.4) : Timer 0 External Input
T1(P3.5) : Timer 1 External Input
WR (P3.6) : External Data Memory Write Strobe
RD (P3.7) : External Data Memory Read Strobe
PORT 4: Port 4 is a 4-bit bi-directional I/O port. The P4.0 also provides the
P4.0−P4.3
I/O
alternate function WAIT which is the wait state control signal.
* Note: TYPE I: input, O: output, I/O: bi-directional.
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