HD6432646 Hitachi, HD6432646 Datasheet - Page 625

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

16.2
16.2.1
There are four 16-bit read-only ADDR registers, ADDRA to ADDRD, used to store the results of
A/D conversion.
The 10-bit data resulting from A/D conversion is transferred to the ADDR register for the selected
channel and stored there. The upper 8 bits of the converted data are transferred to the upper byte
(bits 15 to 8) of ADDR, and the lower 2 bits are transferred to the lower byte (bits 7 and 6) and
stored. Bits 5 to 0 are always read as 0.
The correspondence between the analog input channels and ADDR registers is shown in
table 16-3.
ADDR can always be read by the CPU. The upper byte can be read directly, but for the lower
byte, data transfer is performed via a temporary register (TEMP). For details, see section 16.3,
Interface to Bus Master.
The ADDR registers are initialized to H'0000 by a reset, and in standby mode or module stop
mode.
Table 16-3 Analog Input Channels and Corresponding ADDR Registers
Group 0
AN0
AN1
AN2
AN3
Bit
Initial value
R/W
Channel Set 0 (CH3 = 0)
Register Descriptions
A/D Data Registers A to D (ADDRA to ADDRD)
:
:
:
AD9
Group 1
AN4
AN5
AN6
AN7
15
R
0
AD8
14
R
0
Analog Input Channel
AD7
13
R
0
AD6
12
R
0
Group 0
AN8
AN9
AN10
AN11
AD5
11
R
0
Channel Set 1 (CH3 = 1)
AD4
10
R
0
AD3
R
9
0
AD2
R
8
0
AD1
R
7
0
AD0
R
6
0
—
R
5
0
A/D Data Register
ADDRA
ADDRB
ADDRC
ADDRD
—
R
4
0
—
R
3
0
—
R
2
0
—
R
1
0
—
591
R
0
0