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參數資料
| 型號： | W78C33 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | 8-BIT Microcontroller(8位的微控制器) |
| 中文描述： | 8位微控制器（8位的微控制器） |
| 文件頁數： | 4/18頁 |
| 文件大小： | 217K |
| 代理商： | W78C33 |
W78C33
- 4 -
ALE
Address Latch Enable Output, active high. 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. A single ALE pulse is
skipped during external data memory accesses. ALE goes to a high state during reset with a weak
pull-up.
PSEN
Program Store Enable Output, active low.
PSEN
enables the external ROM onto the Port 0
address/data bus during fetch and MOVC operations.
PSEN
goes to a high state during reset with a
weak pull-up.
XTAL1
Crystal 1. This is the crystal oscillator input. This pin may be driven by an external clock.
XTAL2
Crystal 2. This is the crystal oscillator output. It is the inversion of XTAL1.
V
SS
, V
CC
Power Supplies. These are the chip ground and positive supplies.
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