E202075_HD404889 Datasheet, PDF (135/202 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 81 A/D Start Flag (ADSF)
A/D data register (ADRL: $029, ADRM: $02A, ADRU: $02B):
The A/D data register is a read-only register consisting of a middle 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 10-bit data is stored in this register, and is held until the next conversion operation starts
(figures 82, 83, 84 and 85).
ADRU : $02B
3
2
1
0
ADRM : $02A
3
2
1
0
ADRL : $029
3
2
MSB
bit9
Figure 82 A/D Data Register
LSB Conversion result
bit0
133