AT89C5132-ROTIL datasheet(150/181 Pages) ATMEL

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150

4173D–USB–02/06

AT89C5132

enabled by setting EADC bit in IEN1 register. This flag is set by hardware and must be reset by

software.

21.2

Registers

Table 31. ADCON Register

ADCON (S:F3h) – ADC Control Register

Reset Value = 0000 0000b

Table 32. ADCLK Register

ADCLK (S:F2h) – ADC Clock Divider Register

Reset Value = 0000 0000b

765

4321

ADIDL

ADEN

ADEOC

ADSST

ADCS

Bit Number

Bit

Mnemonic

Description

Reserved

The value read from this bit is always 0. Do not set this bit.

ADIDL

ADC Pseudo-Idle Mode

Set to suspend the CPU core activity (pseudo-idle mode) during conversion.

Clear by hardware at the end of conversion.

5ADEN

ADC Enable Bit

Set to enable the A to D converter.

Clear to disable the A to D converter and put it in low power stand by mode.

4ADEOC

End Of Conversion Flag

Set by hardware when ADC result is ready to be read. This flag can generate an

interrupt.

Must be cleared by software.

ADSST

Start and Status Bit

Set to start an A to D conversion on the selected channel.

Cleared by hardware at the end of conversion.

2 - 1

Reserved

The value read from these bits is always 0. Do not set these bits.

ADCS

Channel Selection Bit

Set to select channel 0 for conversion.

Clear to select channel 1 for conversion.

765

4321

ADCD4

ADCD3

ADCD2

ADCD1

ADCD0

Bit Number

Bit

Mnemonic

Description

7 - 5

Reserved

The value read from these bits is always 0. Do not set these bits.

4 - 0

ADCD4:0

ADC Clock Divider

5-bit divider for ADC clock generation.

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