W77C32F-40 Nuvoton Technology Corporation of America, W77C32F-40 Datasheet - Page 5

• Manufacturer Part Number: W77C32F-40
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W77C32F-40

• Lead Free Status / Rohs Status: Supplier Unconfirmed

4. PIN DESCRIPTION
* Note: TYPE I: input, O: output, I/O: bi-directional.
ALE
RST
XTAL1
XTAL2
V
V
P0.0−P0.7
P1.0−P1.7
P2.0−P2.7
P3.0−P3.7
P4.0−P4.3
EA
PSEN
SS
DD
SYMBOL
TYPE
I/O
I/O
I/O
I/O
I/O
O
O
O
I
I
I
I
I
EXTERNAL ACCESS ENABLE: It should be kept low.
PROGRAM STORE ENABLE: PSEN enables the external ROM data onto the
Port 0 address/data bus during fetch and MOVC operations.
ADDRESS LATCH ENABLE: ALE is used to enable the address latch that
separates the address from the data on Port 0.
RESET: A high on this pin for two machine cycles while the oscillator is running
resets the device.
CRYSTAL1: This is the crystal oscillator input. This pin may be driven by an
external clock.
CRYSTAL2: This is the crystal oscillator output. It is the inversion of XTAL1.
GROUND: Ground potential
POWER SUPPLY: Supply voltage for operation.
PORT 0: Port 0 is an open-drain bi-directional I/O port. This port also provides a
multiplexed low order address/data bus during accesses to external memory.
PORT 1: Port 1 is a bi-directional I/O port with internal pull-ups. The bits have
alternate functions which are described below:
PORT 2: Port 2 is a bi-directional I/O port with internal pull-ups. This port also
provides the upper address bits for accesses to external memory.
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
T0(P3.4)
T1(P3.5)
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.
INT0 (P3.2) : External Interrupt 0
INT1 (P3.3) : External Interrupt 1
RD (P3.7) : External Data Memory Read Strobe
WR (P3.6) : External Data Memory Write Strobe
T2(P1.0): Timer/Counter 2 external count input
T2EX(P1.1): Timer/Counter 2 Reload/Capture/Direction control
RXD1(P1.2): Serial port 1 RXD
TXD1(P1.3): Serial port 1 TXD
INT2(P1.4): External Interrupt 2
INT4(P1.6): External Interrupt 4
INT3 (P1.5): External Interrupt 3
INT5 (P1.7): External Interrupt 5
: Timer 0 External Input
: Timer 1 External Input
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DESCRIPTIONS
Publication Release Date: December 20, 2005
W77C32/W77C032
Revision A5