ST7LITE20F2 datasheet(106/166 Pages) STMICROELECTRONICS

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On-chip peripherals

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Doc ID 8349 Rev 5

11.5.4

Low power modes

Note:

The A/D converter may be disabled by resetting the ADON bit. This feature allows reduced

power consumption when no conversion is needed and between single shot conversions.

11.5.5

Interrupts

None.

11.5.6

Control/status register (ADCCSR)

Read/Write (Except Bit 7 read only)

Reset Value: 0000 0000 (00h)

●

Bit 7 =

EOC End of Conversion

This bit is set by hardware. It is cleared by software reading the ADCDRH register.

0: Conversion is not complete

1: Conversion complete.

●

Bit 6 =

SPEED ADC clock selection

This bit is set and cleared by software. It is used together with the SLOW bit to

configure the ADC clock speed. Refer to the table in the SLOW bit description.

●

Bit 5 =

ADON A/D Converter on

This bit is set and cleared by software.

0: A/D converter and amplifier are switched off

1: A/D converter and amplifier are switched on.

●

Bits 4:3 =

Reserved. Must be kept cleared.

●

Bits 2:0 =

CH[2:0] Channel Selection

These bits are set and cleared by software. They select the analog input to convert.

Table 44.

Low power modes effects

Mode

Description

WAIT

No effect on A/D Converter

HALT

A/D Converter disabled.

After wakeup from HALT mode, the A/D Converter requires a stabilization time

tSTAB (see Electrical Characteristics) before accurate conversions can be

performed.

EOC

SPEED

ADON

CH3

CH2

CH1

CH0

Table 45.

Channel selection bits

Channel pin(1)

CH2

CH1

CH0

AIN0

000

AIN1

001

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