E202075_HD404889 Datasheet, PDF (130/202 Pages) Renesas Technology Corp – Low-Voltage AS Microcomputers with On-Chip LCD Circuit

HD404889/HD404899/HD404878/HD404868 Series
A/D start flag (ADSF: $020,2)
Bit
Read/Write
Initial value on reset
Bit name
3
R/W
0
DTON
2
R/W
0
ADSF
1
R/W
0
WDON
0
R/W
0
LSON
LSON (see low-power mode section)
WDON (see timer section)
A/D start flag (ADSF)
1
A/D conversion starts
0
Indicates end of A/D conversion
DTON (see low-power mode section)
Figure 75 A/D Start Flag (ADSF)
A/D data register (ADRL: $02A, ADRU: $02B):
The A/D data register is a read-only register consisting of a lower and upper 4 bits. This register is not
cleared by a reset. Also, data read during A/D conversion is not guaranteed. At the end of A/D conversion,
the resulting 8-bit data is stored in this register, and is held until the next conversion operation starts
(figures 76, 77, and 78).
ADRU : $02B
3
2
1
0
ADRL : $02A
3
2
1
0
MSB
bit7
LSB
bit0
Conversion result
Figure 76 A/D Data Register
128