H8S-2345 Datasheet, PDF (535/927 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer

14.2 Register Descriptions
Section 14 A/D Converter
14.2.1 A/D Data Registers A to D (ADDRA to ADDRD)
Bit
: 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
AD9 AD8 AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0 — — — — — —
Initial value : 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
R/W
: RRRRRRRRRRRRRRRR
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.
ADDR 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
Group 1
AN0
AN4
AN1
AN5
AN2
AN6
AN3
AN7
A/D Data Register
ADDRA
ADDRB
ADDRC
ADDRD
Rev. 4.00 Feb 15, 2006 page 511 of 900
REJ09B0291-0400