A/D Control Register (Adcr) - Renesas H8S/2437 Hardware Manual

18.3.3

A/D Control Register (ADCR)

ADCR enables an A/D conversion start by an external trigger input.
Bit Bit Name
7 TRGS1
6 TRGS0
5 SCANE
4 SCANS
3 CKS1
2 CKS0
1 —
0 —
[Legend] x: Don't care.
Initial Value R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
Description
Timer Trigger Select 1 and 0
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 conversion start trigger
(TPU) is enabled
10: A/D conversion start by conversion start trigger
(TMR) is enabled
11: A/D conversion start by ADTRG pin is enabled
Scan Mode
Select single mode or scan mode as the A/D
conversion operating mode.
0x: Single mode
10: Scan mode. A/D conversion is performed
continuously for channels 1 to 4
11: Scan mode. A/D conversion is performed
continuously for channels 1 to 8.
Clock Select 1 and 0
Set the A/D conversion time.
Only set bits CKS1 and CKS0 while conversion is
stopped (ADST = 0).
00: A/D conversion time = 530 states (max.)
01: A/D conversion time = 266 states (max.)
10: A/D conversion time = 134 states (max.)
11: A/D conversion time = 68 states (max.)
Reserved
These bits are always read as 0 and cannot be
modified.
Rev. 1.00, 09/03, page 513 of 704