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参数资料
| 型号： | ST72101G2B3/XXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PDIP32 |
| 封装： | 0.400 INCH, PLASTIC, SDIP-32 |
| 文件页数： | 18/85页 |
| 文件大小： | 879K |
| 代理商： | ST72101G2B3/XXX |
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Obsolete
Product(s)
- Obsolete
Product(s)
25/85
ST72101/ST72212/ST72213
I/O PORTS (Cont’d)
5.1.2.4 Analog Alternate Function
When the pin is used as an ADC input the I/O must
be configured as input, floating. The analog multi-
plexer (controlled by the ADC registers) switches
the analog voltage present on the selected pin to
the common analog rail which is connected to the
ADC input.
It is recommended not to change the voltage level
or loading on any port pin while conversion is in
progress. Furthermore it is recommended not to
have clocking pins located close to a selected an-
alog pin.
Warning: The analog input voltage level must be
within the limits stated in the Absolute Maximum
Ratings.
5.1.3 I/O Port Implementation
The hardware implementation on each I/O port de-
pends on the settings in the DDR and OR registers
and specific feature of the I/O port such as ADC In-
put (see Figure 20) 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 il-
lustrated in Figure 19. Other transitions are poten-
tially risky and should be avoided, since they are
likely to present unwanted side-effects such as
spurious interrupt generation.
Figure 19. Recommended I/O State Transition Diagram
with interrupt
INPUT
OUTPUT
no interrupt
INPUT
push-pull
open-drain
OUTPUT
25
相关PDF资料 |
PDF描述 |
|---|---|
| ST72101G2M1/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO28 |
| ST72101G2M6/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO28 |
| ST72212G2B6/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32 |
| ST72212G2M3/XXX | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO28 |
| ST72212G2M6/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ST72101G2B6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH 4 TO 8K ROM/OTP/EPROM, 256 BYTES RAM, ADC, WDG, SPI AND 1 OR 2 TIMERS |
| ST72101G2B6/XXX | 制造商:未知厂家 制造商全称:未知厂家 功能描述:MICROCONTROLLER|8-BIT|ST72 CPU|CMOS|SDIP|32PIN|PLASTIC |
| ST72101G2M1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH 4 TO 8K ROM/OTP/EPROM, 256 BYTES RAM, ADC, WDG, SPI AND 1 OR 2 TIMERS |
| ST72101G2M1/XXX | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| ST72101G2M3 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH 4 TO 8K ROM/OTP/EPROM, 256 BYTES RAM, ADC, WDG, SPI AND 1 OR 2 TIMERS |
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