SH7727 Datasheet, PDF (933/1109 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7700 Series

28.2 Register Descriptions
Section 28 A/D Converter
28.2.1 A/D Data Registers A to D (ADDRA to ADDRD)
Upper register: H
Bit: 15
14
13
12
11
10
9
8
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
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 converted data are
transferred to upper register H (bits 7 to 0) of the A/D data register, and the lower 2 bits are
transferred to lower register L (bits 7 and 6), for storage. Lower register L (bits 5 to 0) is always
read as 0. Table 28.3 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 28.3 Analog Input Channels and A/D Data Registers
Group 0
reserved
reserved
AN2
AN3
Analog Input Channel
Group 1
AN4
AN5
AN6
AN7
A/D Data Register
ADDRA
ADDRB
ADDRC
ADDRD
Rev. 5.00 Dec 12, 2005 page 861 of 1034
REJ09B0254-0500