ST7LITE20 datasheet(83/131 Pages) STMICROELECTRONICS

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ST7LITE2

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10-BIT A/D CONVERTER (ADC) (Cont’d)

11.5.6 Register Description

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 soft-

ware 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 de-

scription.

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

Bit 4:3 = Reserved. Must be kept cleared.

Bit 2:0 = CH[2:0]

Channel Selection

These bits are set and cleared by software. They

select the analog input to convert.

*The number of channels is device dependent. Refer to

the device pinout description.

DATA REGISTER HIGH (ADCDRH)

Read Only

Reset Value: xxxx xxxx (xxh)

Bit 7:0 = D[9:2]

MSB of Analog Converted Value

AMP CONTROL/DATA REGISTER LOW (AD-

CDRL)

Read /Write

Reset Value: 0000 00xx (0xh)

Bit 7:5 = Reserved. Forced by hardware to 0.

Bit 4 = AMPCAL

Amplifier Calibration Bit

This bit is set and cleared by software.

0: Calibration off

1: Calibration on. The input voltage of the amp is

set to 0V.

Bit 3 = SLOW

Slow mode

This bit is set and cleared by software. It is used

together with the SPEED bit to configure the ADC

clock speed as shown on the table below.

Bit 2 = AMPSEL

Amplifier Selection Bit

This bit is set and cleared by software.

0: Amplifier is not selected

1: Amplifier is selected

Note: When AMPSEL=1 it is mandatory that fADC

be less than or equal to 2 MHz.

Bit 1:0 = D[1:0]

LSB of Analog Converted Value

EOC

SPEED ADON

CH3

CH2

CH1

CH0

Channel Pin*

CH2

CH1

CH0

AIN0

AIN1

AIN2

AIN3

AIN4

AIN5

AIN6

000

AMP

CAL

SLOW

AMP-

SEL

fADC

SLOW SPEED

fCPU/2

fCPU

fCPU/4

ST7LITE20 Datasheet(PDF) 83 Page - STMicroelectronics

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