参数资料
型号: ST7PLUSA2M3
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO8
封装: 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8
文件页数: 98/136页
文件大小: 1705K
代理商: ST7PLUSA2M3
Obsolete
Product(s)
- Obsolete
Product(s)
Obsolete
Product(s)
- Obsolete
Product(s)
I/O ports
ST7LITEUS2, ST7LITEUS5
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 29.
Other transitions are potentially risky and should be avoided, since they are likely to present
unwanted side-effects such as spurious interrupt generation.
Figure 29.
Interrupt I/O port state transitions
The I/O port register configurations are summarized in Table 22.
After reset, to configure PA3 as a general purpose output, the application has to program
the MUXCR0 and MUXCR1 registers. See Section 6.5: Register description on page 37
Table 22.
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 23.
I/O port register map and reset values
Address
(Hex.)
Register
label
76543
210
0000h
PADR
Reset
value
MSB
00000
00
LSB
0
0001h
PADDR
Reset
value
MSB
00001
00
LSB
0
0002h
PAOR
Reset
value
MSB
00000
01
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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