参数资料
型号: AT83C5112
厂商: Atmel Corp.
英文描述: 8-bit Microcontroller with A/D Converter
中文描述: 8位微控制器与A / D转换器
文件页数: 21/97页
文件大小: 1229K
代理商: AT83C5112
21
AT8xC5112
4191B
8051
04/03
Figure 2.
Quasi bi-directional Output
Open Drain Output
Configuration
The open-drain output configuration turns off all pull-ups and only drives the pull-down
transistor of the port driver when the port latch contains a logic 0. To be used as a logic
output, a port configured in this manner must have an external pull-up, typically a resis-
tor tied to V
DD
. The pull-down for this mode is the same as for the Quasi bi-directional
mode. The open-drain port configuration is shown in Figure 3.
Figure 3.
Open-drain Output
Push-pull Output
Configuration
The push-pull output configuration has the same pull-down structure as both the open
drain and the Quasi bi-directional output modes, but provides a continuous strong pull-
up when the port latch contains a logic 1. The push-pull mode may be used when more
source current is needed from a port output. The push-pull port configuration is shown in
Figure 4.
2 CPU
CLOCK DELAY
Input
Data
Pin
Strong
Very
Weak
Weak
N
P
P
P
Port latch
Data
Input
Data
Pin
N
Port latch
Data
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