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參數資料
型號: W79E804A
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: 87/115頁
文件大小: 1456K
代理商: W79E804A
W79E804A/803A/802A
Publication Release Date: July 16, 2007
- 87 -
Revision A2
20.3 Push-Pull Output Configuration
The push-pull output mode has two strong pull-up and pull-down structure that support large source
and sink current output. It removes “weak” pull-up and “very weak” pull-up resister and remain “strong
pull-up resister on quasi-bidirectional output mode. The “strong” pull-up is always turns on when port
latch is logic “1” to support source current. The push-pull port configuration is shown in below Figure.
The W79E804 series have three port pins that can’t be configured. They are P1.2, P1.3, and P1.5.
The port pins P1.2 and P1.3 are configured to open drain outputs. They may be used as inputs by
writing ones to their respective port latches.
Port Pin
Input Data
Port Latch
Data
P
N
VDD
Figure
20-4: Push-Pull Output
20.4 Input Only Configuration
By configure this mode, the ports are only digital input and disable digital output. The W79E804 series
can select input pin to Schmitt trigger or TTL level input by PxM1.y and PxM2.y registers.
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