ST7263B datasheet(26/132 Pages) STMICROELECTRONICS

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ST7263B 数据表(PDF) 26 Page - STMicroelectronics

部件名	ST7263B

功能描述	LOW SPEED USB 8-BIT MCU FAMILY WITH FLASH/ROM, UP TO 512 BYTES RAM, 8-BIT ADC, WDG, TIMER, SCI & I²C

PDF	132 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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26 / 132 page

ST7263B

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I/O PORTS (Cont’d)

Analog Alternate Function

When the pin is used as an ADC input the I/O must

be configured as a floating input. The analog mul-

tiplexer (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.

9.3 I/O Port Implementation

The hardware implementation on each I/O port de-

pends on the settings in the DDR register and spe-

cific feature of the I/O port such as ADC Input or

true open drain.

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