HD404328 Datasheet, PDF (59/96 Pages) Hitachi Semiconductor – 4 BIT SINGLE CHIP MICROCOMPUTER

A/D mode register (AMR): $016
3
2
1
0
Initial value: 0000, R/W: W
Switching time
Not used
Analog input selection
HD404328 Series
AMR
Bit 0
0
1
Switching Time
34 tcyc
67 tcyc
Special flag bits: $020
3
2
1
0
AMR
Bit 3 Bit 2
0
0
1
1
0
1
Analog Input
Selection
AN₀
AN₁
AN₂
AN₃
LSON (refer to description of low-power dissipation modes)
WDON (refer to description of timers)
A/D start flag (ADSF)
DTON (refer to description of low-power dissipation modes)
Bit 2
1
0
A/D Start Flag (ADSF)
A/D conversion started
A/D conversion completed
Figure 35 A/D Registers
A/D Data Register (ADRL: $017, ADRU: $018): Eight-bit read-only register that is not cleared by a
reset. Note that data read from this register during A/D conversion cannot be guaranteed. After the
completion of A/D conversion, the resultant eight-bit data is held in this register, as shown in figure 36,
until the start of the next conversion.
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