HD6412350 Hitachi, HD6412350 Datasheet - Page 645

• Manufacturer Part Number: HD6412350
• Description: (HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
• Manufacturer: Hitachi

15.2
15.2.1
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 15-
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 15.3,
Interface to Bus Master.
The ADDR registers are initialized to H'0000 by a reset, and in standby mode or module stop
mode.
Table 15-3 Analog Input Channels and Corresponding ADDR Registers
Group 0
AN0
AN1
AN2
AN3
Bit
Initial value
R/W
Register Descriptions
A/D Data Registers A to D (ADDRA to ADDRD)
Analog Input Channel
:
:
:
AD9
15
R
0
AD8
14
R
Group 1
AN4
AN5
AN6
AN7
0
AD7
13
R
0
AD6
12
R
0
AD5
11
R
0
AD4
10
R
0
A/D Data Register
ADDRA
ADDRB
ADDRC
ADDRD
AD3
R
9
0
AD2
R
8
0
AD1
R
7
0
AD0
R
6
0
—
R
5
0
—
R
4
0
—
R
3
0
—
R
2
0
—
R
1
0
—
625
R
0
0