h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 633

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

16.2.3
ADCR is an 8-bit readable/writable register that enables or disables external triggering of A/D
conversion operations and sets the A/D conversion time.
ADCR is initialized to H'33 by a reset, and in standby mode or module stop mode.
Bits 7 and 6—Timer Trigger Select 1 and 0 (TRGS1, TRGS0): Select enabling or disabling of
the start of A/D conversion by a trigger signal. Only set bits TRGS1 and TRGS0 while conversion
is stopped (ADST = 0).
Bits 5, 4, 1, and 0—Reserved: These bits are reserved; they are always read as 1 and cannot be
modified.
Bits 3 and 2—Clock Select 1 and 0 (CKS1, CKS0): These bits select the A/D conversion time.
The conversion time should be changed only when ADST = 0.
Set bits CKS1 and CKS0 to give a conversion time of at least 10 µs.
Bit 7
TRGS1
0
1
Bit 3
CKS1
0
1
Bit
Initial value
R/W
A/D Control Register (ADCR)
Bit 6
TRGS0
0
1
0
1
Bit 2
CKS0
0
1
0
1
:
:
:
TRGS1
R/W
7
0
Description
A/D conversion start by software is enabled
A/D conversion start by TPU conversion start trigger is enabled
Setting prohibited
A/D conversion start by external trigger pin (ADTRG) is enabled
Description
Conversion time = 530 states (max.)
Conversion time = 266 states (max.)
Conversion time = 134 states (max.)
Conversion time = 68 states (max.)
TRGS0
R/W
6
0
—
—
5
1
—
—
4
1
Rev. 5.00 Sep 22, 2005 page 607 of 1136
CKS1
R/W
3
0
CKS0
R/W
2
0
Section 16 A/D Converter
REJ09B0257-0500
—
—
1
1
(Initial value)
(Initial value)
—
—
0
1