参数资料
型号: SAB-C515-RN
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PQCC68
封装: PLASTIC, LCC-68
文件页数: 105/162页
文件大小: 771K
代理商: SAB-C515-RN
Semiconductor Group
6-4
On-Chip Peripheral Components
C515
The output drivers of port 1 to 5 have internal pullup FET’s (see figure 6-2). Each I/O line can be
used independently as an input or output. To be used as an input, the port bit stored in the bit latch
must contain a one (1) (that means for figure 6-2: Q=0), which turns off the output driver FET n1.
Then, for ports 1 to 5 the pin is pulled high by the internal pullups, but can be pulled low by an
external source. When externally pulled low the port pins source current (
I
IL or ITL). For this reason
these ports are called "quasi-bidirectional".
Figure 6-2
Basic Output Driver Circuit of Ports 1 to 5
MCS01823
D
CLK
Bit
Latch
Q
Internal
Pull Up
Arrangement
Pin
Read
Latch
to
Latch
Read
Pin
Write
V
CC
Int. Bus
n1
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