HD404374 Datasheet, PDF (105/161 Pages) Renesas Technology Corp – Low-Voltage AS Microcomputers with On-Chip A/D Converter

HD404374/HD404384/HD404389/HD404082/HD404084 Series
A/D mode register (AMR: $028):
The A/D mode register is a 4-bit write-only register that shows the A/D converter speed setting and
information on the analog input pin specification. The A/D conversion time is selected by bit 0, and the
channel by bits 1, 2, and 3 (figure 64).
A/D start flag (ADSF: $020,2):
A/D conversion is started by writing 1 to the A/D start flag. When conversion ends, the converted data is
placed in the A/D data register and the A/D start flag is cleared at the same time. (figure 65).
A/D mode register (AMR: $028)
Bit
Read/Write
Initial value on reset
Bit name
3
W
0
AMR3
2
W
0
AMR2
1
W
0
AMR1
0
W
0
AMR0
AMR0 _{A/D conversion time}
0
65 tcyc
1
125 tcyc
AMR3 AMR2 AMR1 Analog input channel selection
0
—
No selection
0
0
AN0
1
1
AN1
0
0
1
1
0
1
1
AN2
AN3
AN4*
AN5*
Note: * Applies to the HD404389 series. This selection is not available on the HD
404374 and HD404384 series.
Figure 64 A/D Mode Register (AMR)
Rev.5.00, Sep.11.2003, page 105 of 161