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16.1.4
Register Configuration
Table 16.2 summarizes the A/D converter’s registers.
Table 16.2
A/D Converter Registers
Address
Name
Abbreviation
R/W
Initial Value
H'FFFB0
A/D data register A H
ADDRAH
R
H'00
H'FFFB1
A/D data register A L
ADDRAL
R
H'00
H'FFFB2
A/D data register B H
ADDRBH
R
H'00
H'FFFB3
A/D data register B L
ADDRBL
R
H'00
H'FFFB4
A/D data register C H
ADDRCH
R
H'00
H'FFFB5
A/D data register C L
ADDRCL
R
H'00
H'FFFB6
A/D data register D H
ADDRDH
R
H'00
H'FFFB7
A/D data register D L
ADDRDL
R
H'00
H'FFFB8
A/D control/status register
ADCSR
R/(W)
*
H'00
H'FFFB9
A/D control register
ADCR
R/W
H'7E
Note:
*
Only 0 can be written in bit 7, to clear the flag.
16.2
Register Descriptions
16.2.1
A/D Data Registers A to D (ADDRA to ADDRD)
Bit
ADDRn
Initial value
14
AD8
0
R
12
AD6
0
R
10
AD4
0
R
8
AD2
0
R
6
AD0
0
R
0
—
0
R
4
—
0
R
2
—
0
R
15
AD9
0
R
13
AD7
0
R
11
AD5
0
R
9
AD3
0
R
7
AD1
0
R
1
—
0
R
5
—
0
R
3
—
0
R
A/D conversion data
10-bit data giving an
A/D conversion result
Reserved bits
Read/Write
(n = A to D)
The four A/D data registers (ADDRA to ADDRD) are 16-bit read-only registers that store the
results of A/D conversion.
An A/D conversion produces 10-bit data, which is transferred for storage into the A/D data
register corresponding to the selected channel. The upper 8 bits of the result are stored in the upper
byte of the A/D data register. The lower 2 bits are stored in the lower byte. Bits 5 to 0 of an A/D
data register are reserved bits that are always read as 0. Table 16.3 indicates the pairings of analog
input channels and A/D data registers.
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Страница 408: ...392 18 5 Output Load Circuit VCC 2 4 kΩ 12 kΩ 30 pF LSI output pin Figure 18 7 Output Load Condition ...
Страница 457: ...441 DEC VIN CH3 to CH0 A D converter Internal data bus Figure C 17 Port B Block Diagram PB7 to PB0 ...