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14.2
Register Descriptions
14.2.1
A/D Data Registers A to D (ADDRA to ADDRD)
Bit
:
15
AD9 AD8 AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0 —
Initial value :
0
R/W
:
R
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
14-3.
The ADDR registers 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
14.3, Interface to Bus Master.
The ADDR registers are initialized to H'0000 by a reset, and in standby mode or module stop
mode.
Table 14-3 Analog Input Channels and Corresponding ADDR Registers
Analog Input Channel
Group 0
AN0
AN1
AN2
AN3
14
13
12
11
10
0
0
0
0
R
R
R
R
Group 1
AN4
AN5
AN6
AN7
9
8
7
6
0
0
0
0
0
R
R
R
R
R
A/D Data Register
ADDRA
ADDRB
ADDRC
ADDRD
Rev. 5.00, 12/03, page 521 of 1088
5
4
3
2
1
—
—
—
—
0
0
0
0
0
R
R
R
R
R
0
—
0
R
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