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: 83/124页
文件大小: 1995K
代理商: ST7PLU05MAE
ST7LUS5, ST7LU05, ST7LU09
I/O ports
9.6
I/O port implementation
The hardware implementation on each I/O port depends on the settings in the DDR and OR
registers and specific feature of the I/O port such as ADC Input or true open drain.
Switching these I/O ports from one state to another should be done in a sequence that
prevents unwanted side effects. Recommended safe transitions are illustrated in Figure 27.
Other transitions are potentially risky and should be avoided, since they are likely to present
unwanted side-effects such as spurious interrupt generation.
Figure 27.
Interrupt I/O port state transitions
The I/O port register configurations are summarized in the following table:
Note: After reset, to configure PA3 as a general purpose output, the application has to
program the MUXCR0 and MUXCR1 registers. See Section 6.4 on page 36.
Table 31.
Port configuration
Port
Pin name
Input (DDR=0)
Output (DDR=1)
OR = 0
OR = 1
OR = 0
OR = 1
Port A
PA0:2,
PA4:5
floating
pull-up interrupt
open drain
push-pull
PA3
-
open drain
push-pull
Table 32.
I/O port register map and reset values
Address (Hex.) Register label
7654
3210
0000h
PADR
Reset value
MSB
0000
000
LSB
0
0001h
PADDR
Reset value
MSB
0000
100
LSB
0
0002h
PAOR
Reset value
MSB
0000
001
LSB
0
01
floating/pull-up
interrupt
INPUT
00
floating
(reset state)
INPUT
10
open-drain
OUTPUT
11
push-pull
OUTPUT
XX = DDR, OR
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