SH7052 datasheet(593/919 Pages) RENESAS

593 / 919 page

567

The operation of the A/D converter after ADF is set to 1 differs between single mode and scan

mode.

In single mode, after the A/D converter transfers the digital value to ADDR, ADF is set to 1

and the A/D converter enters the idle state. In scan mode (continuous scanning), after all the

set conversions end ADF is set to 1 and conversion is continued. For example, in the case of

12-channel scanning, ADF is set to 1 immediately after the end of conversion for AN8 to

AN11 (group 2).

In scan mode (single-cycle scanning), after all the set analog conversions end ADF is set to 1

and conversion is terminated. For example, in the case of 12-channel scanning, ADF is set to 1

immediately after the end of conversion for AN0 to AN11.

• Bit 6—A/D Interrupt Enable (ADIE): Enables or disables the A/D interrupt (ADI).

To prevent incorrect operation, ensure that the ADST bit in A/D control registers 0 and 1

(ADCR0) is cleared to 0 before switching the operating mode.

Bit 6:

ADIE

Description

A/D interrupt (ADI0) is disabled

(Initial value)

A/D interrupt (ADI0) is enabled

When A/D conversion ends and the ADF bit is set to 1, an A/D0 or A/D1 A/D interrupt (ADI0,

ADI1) will be generated If the ADIE bit is 1. ADI0 and ADI1 are cleared by clearing ADF or

ADIE to 0.

• Bits 5 and 4: A/D Mode 1 and 0 (ADM1, ADM0): These bits select the A/D conversion mode

from single mode, 4-channel scan mode, 8-channel scan mode, and 12-channel scan mode.

To prevent incorrect operation, ensure that the ADST bit in A/D control registers 1 and 0

(ADCR1, ADCR0) is cleared to 0 before switching the operating mode.

Bit 5:

ADM1

Bit 4:

ADM0

Description

Single mode

(Initial value)

4-channel scan mode (analog groups 0, 1, 2)

8-channel scan mode (analog groups 0, 1)

12-channel scan mode (analog groups 0, 1, 2)

When ADM1 and ADM0 are set to 00, single mode is set. In single mode, operation ends after

A/D conversion has been performed once on the analog channels selected with bits CH3 to

CH0 in ADCSR.

SH7052 Datasheet(PDF) 593 Page - Renesas Technology Corp