ST10F296 datasheet(177/346 Pages) STMICROELECTRONICS

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ST10F296E

Analog-to-digital converter (ADC)

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14.1

Mode selection and operation

The analog input channels AN0 to AN15 are alternate functions of Port 5 which is a 16-bit

input-only port (see Section 13.7.2: Alternate functions of port 5 on page 150). Port 5 lines

may either be used as analog or digital inputs. No special action is required to configure the

lines as analog inputs. An additional register P5DIDIS can be used to protect the ADC input

analog section from disabling the digital input section.

The analog input channels AN16 to AN31 are alternate functions of XPort 10 which is also a

16-bit input-only port (see Section 13.12.2: Alternate functions of XPort 10 on page 173).

XPort 10 lines may also be used as either analog or digital inputs and the additional

XP10DIDIS register can be used to protect the ADC input analog section from disabling the

digital input section.

To configure XPort 10 lines as analog inputs, it is first recommended to set register

XP10DIDIS. Next, bit ADCMUX of register XMISC must be set. This ensures that all analog

input channels of Por t5 are disabled and that the analog signal to the ADC is provided

through the XPort 10 pins.

Note:

Both the XMISC and XP10DIDIS registers can be accessed only after the XMISCEN and

XPEN bits of the XPERCON and SYSCON registers have been set.

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ST10F296 データシート(PDF) 177 Page - STMicroelectronics