HD404629R Datasheet, PDF (97/157 Pages) Renesas Technology Corp – AS Microcomputer Incorporating a DTMF Generator Circuit

HD404629R Series
A/D interrupt request flag
(IFAD)
A/D mode register
2
(AMR)
AN₀
AN₁
AN₂
AN₃
+
COMP
–
Off in stop, watch,
and subactive
modes
Encoder
A/D data register
(ADR)
A/D control
logic
Conversion time
control
A/D start flag
(ADSF)
AV_CC
AV_SS
Resistance ladder
Data bus
Signal line
Figure 81 Block Diagram of A/D Converter
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 3 and 2 select a channel, as shown in figure 82.
95