Renesas Stereo System SH7709S User Manual
Rev. 5.00, 09/03, page 617 of 760
20.2
Register Descriptions
20.2.1
A/D Data Registers A to D (ADDRA to ADDRD)
Upper register: H
Bit:
7
6
5
4
3
2
1
0
AD9
AD8
AD7
AD6
AD5
AD4
AD3
AD2
Initial value:
0
0
0
0
0
0
0
0
R/W:
R
R
R
R
R
R
R
R
Lower register: L
Bit:
7
6
5
4
3
2
1
0
AD1
AD0
—
—
—
—
—
—
Initial value:
0
0
0
0
0
0
0
0
R/W:
R
R
R
R
R
R
R
R
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.
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 (bits 7 to 0) of the A/D data register. The lower 2 bits are stored in the lower byte (bits 7 and
6). Bits 5 to 0 of an A/D data register are reserved bits that are always read as 0. Table 20.3
indicates the pairings of analog input channels and A/D data registers.
register corresponding to the selected channel. The upper 8 bits of the result are stored in the upper
byte (bits 7 to 0) of the A/D data register. The lower 2 bits are stored in the lower byte (bits 7 and
6). Bits 5 to 0 of an A/D data register are reserved bits that are always read as 0. Table 20.3
indicates the pairings of analog input channels and A/D data registers.
The A/D data registers are initialized to H'0000 by a reset and in standby mode.
Table 20.3
Analog Input Channels and A/D Data Registers
Analog Input Channel
Group 0
Group 1
A/D Data Register
AN0
AN4
ADDRA
AN1
AN5
ADDRB
AN2
AN6
ADDRC
AN3
AN7
ADDRD