Datasheet

Section 16 A/D Converter
Rev. 3.00 Mar 17, 2006 page 750 of 926
REJ09B0283-0300
16.3.3 A/D Control Register (ADCR)
ADCR enables A/D conversion start by an external trigger input.
• H8S/2678 Group
Bit Bit Name Initial Value R/W Description
7
6
TRGS1
TRGS0
0
0
R/W
R/W
Timer Trigger Select 1 and 0
These bits select enabling or disabling of the start
of A/D conversion by a trigger signal.
00: A/D conversion start by external trigger is
disabled
01: A/D conversion start by external trigger (TPU)
is enabled
10: A/D conversion start by external trigger (TMR)
is enabled
11: A/D conversion start by external trigger pin
(ADTRG) is enabled
5, 4 — All 1 — Reserved
These bits are always read as 1 and cannot be
modified.
3 CKS1 1 R/W Clock Select 1
Used together with the CKS bit in ADCSR to set
the A/D conversion time. See the description of the
CKS bit for details.
2 CH3 1 R/W Channel Select 3
Used together with bits CH2 to CH0 in ADCSR to
select the analog input channel(s). See the
description of bits CH2 to CH0 for details.
1, 0 — All 1 — Reserved
These bits are always read as 1 and cannot be
modified.