h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 311

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

10.2.2
There are two 16-bit readable/writable D/A data registers: DADRA and DADRB. DADRA
corresponds to PWM D/A channel A, and DADRB to PWM D/A channel B. The CPU can read
and write the PWM D/A data register values, but since DADRA and DADRB are 16-bit registers,
data transfers between them and the CPU are performed using a temporary register (TEMP). See
section 10.3, Bus Master Interface, for details.
The least significant (CPU) bit of DADRA is not used and is always read as 1.
DADR is initialized to H'FFFF by a reset, and in the standby modes, watch mode, subactive mode,
subsleep mode, and module stop mode.
Bit (CPU)
Bit (Data)
DADRA
Initial value
Read/Write
DADRB
Initial value
Read/Write
D/A Data Registers A and B (DADRA and DADRB)
DA13
DA13
R/W
R/W
15
13
1
1
DA12
DA12
R/W
R/W
14
12
1
1
DA11
DA11
R/W
R/W
13
11
1
1
DA10
DA10
R/W
R/W
DADRH
12
10
1
1
DA9
R/W
DA9
R/W
11
9
1
1
DA8
R/W
DA8
R/W
10
8
1
1
DA7
R/W
DA7
R/W
9
7
1
1
DA6
R/W
DA6
R/W
8
6
1
1
Rev. 4.00 Jun 06, 2006 page 257 of 1004
DA5
R/W
DA5
R/W
7
5
1
1
DA4
R/W
DA4
R/W
6
4
1
1
DA3
R/W
DA3
R/W
5
3
1
1
Section 10 14-Bit PWM D/A
DADRL
DA2
R/W
DA2
R/W
4
2
1
1
DA1
R/W
DA1
R/W
3
1
1
1
REJ09B0301-0400
DA0
R/W
DA0
R/W
2
0
1
1
CFS
R/W
CFS
R/W
—
1
1
1
REGS
R/W
—
—
—
0
1
1