W77LE532/W77L532A
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
INT0
(P3.2) : External Interrupt 0
P3.0−P3.7
I/O
INT1
(P3.3) : External Interrupt 1
T0(P3.4)
T1(P3.5)
: Timer 0 External Input
: Timer 1 External Input
WR
(P3.6) : External Data Memory Write Strobe
RD
(P3.7) : External Data Memory Read Strobe
P4.0−P4.3
I/O
PORT 4:
Port 4 is a 4-bit bi-directional I/O port. The P4.0 also provides the
alternate function
WAIT
which is the wait state control signal. The P4.3 also
provide the alternate function /REBOOT which is H/W reboot from LD flash.
* Note: TYPE
I: input, O: output, I/O: bi-directional.
-5-
Publication Release Date: February 1, 2007
Revision A7
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