SH7058 Datasheet, PDF (669/1130 Pages) Renesas Technology Corp – Renesas SuperHTM RISC engine

• 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
0
1
Bit 4:
ADM0
0
1
0
1
Description
Single mode
4-channel scan mode (analog groups 0, 1, 2, 3, 4, 5)
8-channel scan mode (analog groups 0, 1, 3, 4)
12-channel scan mode (analog groups 0, 1, 2, 3, 4, 5)
(Initial value)
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.
When ADM1 and ADM0 are set to 01, 4-channel scan mode is set. In scan mode, A/D
conversion is performed continuously on a number of channels. The channels on which A/D
conversion is to be performed in scan mode are set with bits CH3 to CH0 in ADCSR1 and
ADCSR0. In 4-channel scan mode, conversion is performed continuously on the channels in
one of analog groups 0 (AN0 to AN3), 1 (AN4 to AN7), 2 (AN8 to AN11), 3 (AN12 to AN15,
4 (AN16 to AN19), or 5 (AN20 to AN23).
When the ADCS bit is cleared to 0, selecting scanning of all channels within the group (AN0
to AN3, AN4 to AN7, AN8 to AN11, or AN12 to AN15, AN16 to AN19, AN20 to AN23),
conversion is performed continuously, once only for each channel within the group, and
operation stops on completion of conversion for the last (highest-numbered) channel.
When ADM1 and ADM0 are set to 10, 8-channel scan mode is set. In 8-channel scan mode,
conversion is performed continuously on the 8 channels in analog groups 0 (AN0 to AN3) and
1 (AN4 to AN7) or analog groups 3 (AN12 to AN15) and 4 (AN16 to AN19). When the
ADCS bit is cleared to 0, selecting scanning of all channels within the groups (AN0 to AN7 or
AN12 to AN19), conversion is performed continuously, once only for each channel within the
groups, and operation stops on completion of conversion for the last (highest-numbered)
channel.
When ADM1 and ADM0 are set to 11, 12-channel scan mode is set. In 12-channel scan mode,
conversion is performed continuously on the 12 channels in analog groups 0 (AN0 to AN3), 1
(AN4 to AN7), and 2 (AN8 to AN11) or analog groups 3 (AN12 to AN15), 4 (AN16 to
AN19), and 5 (AN20 to AN23). When the ADCS bit is cleared to 0, selecting scanning of all
channels within the groups (AN0 to AN11 or AN12 to AN19), conversion is performed
continuously, once only for each channel within the groups, and operation stops on completion
of conversion for the last (highest-numbered) channel.
For details of the operation in single mode and scan mode, see section 17.4, Operation.
Rev. 3.0, 09/04, page 628 of 1086