参数资料
型号: AT89EB5114
厂商: Atmel Corp.
元件分类: 8位微控制器
英文描述: Low-pin-count 8-bit microcontroller with A/D converter
中文描述: 低引脚数的8 - A / D转换位微控制器
文件页数: 33/95页
文件大小: 1126K
代理商: AT89EB5114
33
4311A–8051–01/05
Figure 11.
Quasi-Bidirectional 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 the quasi-bidirectional mode.
The open drain port configuration is shown in Figure 12.
Figure 12.
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-bidirectional 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 13.
2 CPU
CLOCK DELAY
Input
Data
Pin
Strong
Medium
N
P
P
Weak
P
Port Latch
Data
DPU
AUXR.7
Input
Data
Pin
N
Port latch
Data
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