參數(shù)資料
型號(hào)： ST7265
英文描述： ST7 - LOW-POWER. FULL-SPEED USB 8-BIT MCU WITH 32K FLASH. 5K RAM. FLASH CARD I/F. TIMER. PWM. ADC. I2C
中文描述： ST7的-低功耗。全速USB 8位32K快閃微控制器。 5K內(nèi)存。閃存卡的I /樓計(jì)時(shí)器。脈寬調(diào)制。 ADC的。的I2C
文件頁(yè)數(shù)： 113/166頁(yè)
文件大小： 2089K
代理商： ST7265
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ST7265x
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I/O PORTS (Cont’d)
9.2.3 Alternate Functions
When an on-chip peripheral is configured to use a
pin, the alternate function is automatically select-
ed. This alternate function takes priority over the
standard I/O programming.
When the signal is coming from an on-chip periph-
eral, the I/O pin is automatically configured in out-
put 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 input mode. In
this case, the pin state is also digitally readable by
addressing the DR register.
Note: Input pull-up configuration can cause unex-
pected value at the input of the alternate peripheral
input. When an on-chip peripheral use a pin as in-
put and output, this pin has to be configured in in-
put floating mode.
CAUTION: The alternate function must not be ac-
tivated as long as the pin is configured as input
with interrupt, in order to avoid generating spurious
interrupts.
Analog alternate function
When the pin is used as an ADC input, the I/O
must be configured as floating input. The analog
multiplexer (controlled by the ADC registers)
switches the analog voltage present on the select-
ed pin to the common analog rail which is connect-
ed 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 maxi-
mum ratings.
1
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