HD404054 Datasheet, PDF (76/101 Pages) Hitachi Semiconductor – HMCS400-series microcomputers designed to increase program productivity with large-capacity memory

HD404054 Series/HD404094 Series
Comparator
The block diagram of the comparator is shown in figure 60. The comparator compares input voltage with
the reference voltage.
Setting 1 to bit 3 (CER3) of the compare enable register (CER: $018) executes a voltage comparison.
When an input voltage at COMP₀, COMP₁ is higher than the reference voltage, the TM or TMD command
sets the status flag (ST) high for the corresponding bits of the compare data register (CDR: $017) to
COMP₀ and COMP₁. On the other hand, when an input voltage at COMP₀, COMP₁ is lower, the TM or
TMD command clears the ST to 0.
COMP₀
COMP₁
VC_ref
+
Com-
parator
–
Comparator data
register (CDR)
Comparator enable
register (CER)
Figure 60 Block Diagram of Comparator
76