HD404849 Datasheet, PDF (93/125 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer

HD404849 Series
A/D Mode Register (AMR: $016): Four-bit write-only register which selects the A/D conversion period
and indicates analog input pin information. Bit 0 of the A/D mode register selects the A/D conversion
period, and bits 1 to 3 select a channel, as shown in figure 78.
A/D mode register (AMR: $016)
Bit
Initial value
Read/Write
Bit name
3
0
W
AMR3
2
0
W
AMR2
1
0
W
AMR1
0
0
W
AMR0
AMR3
0
0
1
1
0
0
1
1
AMR2
0
1
0
1
0
1
0
1
AMR1
0
0
0
0
1
1
1
1
Analog input selection
AN₀
AN₁
AN₂
AN₃
AN₄
AN₅
AN₆
AN₇
AMR0
0
1
Conversion time
34t_cyc
67t_cyc
Figure 78 A/D Mode Register (AMR)
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