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參數(shù)資料
型號: W77L32
廠商: WINBOND ELECTRONICS CORP
元件分類: 8位微控制器
英文描述: 8-BIT MICROCONTROLLER
中文描述: 8位微控制器
文件頁數(shù): 5/74頁
文件大小: 871K
代理商: W77L32
Preliminary W77L32
Publication Release Date: November 2, 2001
Revision A1
- 5 -
4. PIN DESCRIPTION
SYMBOL
TYPE
I
DESCRIPTIONS
EA
EXTERNAL ACCESS ENABLE
: It should be kept low.
PSEN
O
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:
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
ALE
O
RST
I
XTAL1
I
XTAL2
V
SS
V
DD
P0.0
P0.7
O
I
I
I/O
P1.0
P1.7
I/O
INT3 (P1.5): External Interrupt 3
INT4(P1.6) : External Interrupt 4
INT5 (P1.7): External Interrupt 5
P2.0
P2.7
I/O
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
P3.0
P3.7
I/O
INT0 (P3.2): External Interrupt 0
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 alternate
function WAIT which is the wait state control signal.
P4.0
P4.3
I/O
* Note:
TYPE
I: input, O: output, I/O: bi-directional.
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