Datasheet

Rev.6.00 Oct.28.2004 page 542 of 1016
REJ09B0138-0600H
16.2 Register Descriptions
16.2.1 A/D Data Registers A to D (ADDRA to ADDRD)
Bit :1514131211109876543210
AD9AD8AD7AD6AD5AD4AD3AD2AD1AD0——————
Initial value : 0 0 0 0000000000000
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 16-3.
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 16.3, Interface to Bus Master.
The ADDR registers are initialized to H'0000 by a reset, and in standby mode or module stop mode.
Table 16-3 Analog Input Channels and Corresponding ADDR Registers
Analog Input Channel
Group 0 Group 1 A/D Data Register
AN0 AN4 ADDRA
AN1 AN5 ADDRB
AN2 AN6 ADDRC
AN3 AN7 ADDRD
16.2.2 A/D Control/Status Register (ADCSR)
Bit:76543210
ADF ADIE ADST SCAN CKS CH2 CH1 CH0
Initial value : 0 0 0 0 0 0 0 0
R/W : R/(W)* R/W R/W R/W R/W R/W R/W R/W
Note: * Only 0 can be written to bit 7, to clear this flag.
ADCSR is an 8-bit readable/writable register that controls A/D conversion operations and shows the status of the
operation.
ADCSR is initialized to H'00 by a reset, and in hardware standby mode or module stop mode.