參數(shù)資料
型號: ST7FLU05MAE
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO8
封裝: 0.150 INCH, LEAD FREE, PLASTIC, SOP-8
文件頁數(shù): 80/124頁
文件大小: 2186K
代理商: ST7FLU05MAE
Obsolete
Product(s)
- Obsolete
Product(s)
ST7LUS5, ST7LU05, ST7LU09
I/O ports
59/124
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 27.
I/O port general block diagram
DR
DDR
OR
DA
T
A
B
U
S
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 28 below)
P-buffer
(see Table 28 below)
Diodes
(see Table 28 below)
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