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data register are reserved bits that are always read as 0. Table 14.3 indicates the pairings of analog
input channels and A/D data registers.
The CPU can always read and write the A/D data registers. The upper byte can be read directly,
but the lower byte is read through a temporary register (TEMP). For details see section 14.3, CPU
Interface.
The A/D data registers are initialized to H'0000 by a reset and in standby mode.
Table 14.3
Analog Input Channels and A/D Data Registers (ADDRA to ADDRD)
Analog Input Channel
Group 0
Group 1
A/D Data Register
AN
0
AN
4
ADDRA
AN
1
AN
5
ADDRB
AN
2
AN
6
ADDRC
AN
3
AN
7
ADDRD
14.2.2
A/D Control/Status Register (ADCSR)
Bit
Initial value
Read/Write
7
ADF
0
R/(W)
6
ADIE
0
R/W
5
ADST
0
R/W
4
SCAN
0
R/W
3
CKS
0
R/W
0
CH0
0
R/W
2
CH2
0
R/W
1
CH1
0
R/W
*
Note: Only 0 can be written, to clear the flag.
*
A/D end flag
Indicates end of A/D conversion
A/D interrupt enable
Enables and disables A/D end interrupts
A/D start
Starts or stops A/D conversion
Scan mode
Selects single mode or scan mode
Clock select
Selects the A/D conversion time
Channel select 2 to 0
These bits select analog
input channels
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