3069RF-ZTAT Datasheet, PDF (567/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

15.2 Register Descriptions
15.2.1 A/D Data Registers A to D (ADDRA to ADDRD)
Bit
ADDRn
Initial value
Read/Write
(n = A to D)
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 — — — — — —
000000000000 0000
RRRRRRRRRRRR RRRR
A/D conversion data
10-bit data giving an
A/D conversion result
Reserved bits
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 result are stored in the
upper byte of the A/D data register. The lower 2 bits are stored in the lower byte. Bits 5 to 0 of an
A/D data register are reserved bits that are always read as 0. Table 15.3 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 15.3, CPU
Interface.
The A/D data registers are initialized to H'0000 by a reset and in standby mode.
Table 15.3 Analog Input Channels and A/D Data Registers
Analog Input Channel
Group 0
Group 1
AN
0
AN
1
AN₂
AN₃
AN
4
AN
5
AN₆
AN₇
A/D Data Register
ADDRA
ADDRB
ADDRC
ADDRD
Rev. 5.0, 09/04, page 545 of 978