参数资料
型号: ST7PLU05MAE
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO8
封装: 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8
文件页数: 79/124页
文件大小: 1995K
代理商: ST7PLU05MAE
I/O ports
ST7LUS5, ST7LU05, ST7LU09
9.2.3
Alternate functions
When an on-chip peripheral is configured to use a pin, the alternate function is automatically
selected. This alternate function takes priority over the standard I/O programming under the
following conditions:
When the signal is coming from an on-chip peripheral, the I/O pin is automatically
configured in output mode (push-pull or open drain according to the peripheral).
When the signal is going to an on-chip peripheral, the I/O pin must be configured in
floating input mode. In this case, the pin state is also digitally readable by addressing
the DR register.
Note:
Input pull-up configuration can cause unexpected value at the input of the alternate
peripheral input.
When an on-chip peripheral use a pin as input and output, this pin has to be configured in
input floating mode.
Figure 26.
I/O port general block diagram
DR
DDR
OR
DATA
BUS
PAD
VDD
ALTERNATE
ENABLE
ALTERNATE
OUTPUT
1
0
OR SEL
DDR SEL
DR SEL
PULL-UP
CONDITION
P-BUFFER
N-BUFFER
1
0
ANALOG
INPUT
If implemented
ALTERNATE
INPUT
VDD
FROM
OTHER
BITS
EXTERNAL
SOURCE (eix)
INTERRUPT
POLARITY
SELECTION
CMOS
SCHMITT
TRIGGER
REGISTER
ACCESS
(see Table 27 below)
P-BUFFER
(see Table 27 below)
DIODES
(see Table 27 below)
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