參數(shù)資料
型號: W78IRD2
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): 5/76頁
文件大?。?/td> 646K
代理商: W78IRD2
W78IRD2/W78IRD2A
Publication Release Date: February 14, 2007
- 5 -
Revision A9
4. PIN DESCRIPTION
SYMBOL
TYPE*
DESCRIPTIONS
EA
I
EXTERNAL ACCESS ENABLE: This pin forces the processor to execute
instructions in external ROM. The ROM address and data are not presented
on the bus if the
EA
pin is high.
PSEN
O H
PROGRAM STORE ENABLE:
PSEN
indicates external ROM data is on the
Port 0 address/data bus. If internal ROM is accessed, no
PSEN
strobe signal
is present on this pin.
ALE
O H
ADDRESS LATCH ENABLE: ALE is used to enable the address latch that
separates the address from the data on Port 0. ALE runs at 1/6th of the
oscillator frequency.
RST
I L
RESET: If this pin is set high for two machine cycles while the oscillator is
running, the W78IRD2 is reset.
XTAL1
I
CRYSTAL 1: Crystal oscillator input or external clock input.
XTAL2
O
CRYSTAL 2: Crystal oscillator output.
V
SS
I
GROUND: ground potential.
V
DD
I
POWER SUPPLY: Supply voltage for operation.
P0.0
P0.7 I/O D
PORT 0: 8-bit, bi-directional I/O port, the same as that of the standard 80C52
Port 0 has internal pull-up resisters enabled by software.
P1.0
P1.7 I/O H PORT 1: 8-bit, bi-directional I/O port, the same as that of the standard 80C52.
P2.0
P2.7 I/O H provides the upper address bits when accessing external memory.
P3.0
P3.7 I/O H PORT 3: 8-bit, bi-directional I/O port, the same as that of the standard 80C52.
P4.0
P4.3 I/O H PORT 4: 4-bit, bi-directional I/O port with chip-select functions.
* Note:
TYPE
I: input, O: output, I/O: bi-directional, H: pull-high, L: pull-low, D: open drain
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