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CHAPTER 19 LOW VOLTAGE DETECTION/CPU OPERATING DETECTION RESET
19.2 Configuration of Low Voltage/CPU Operating Detection
Reset Circuit
Low voltage/CPU operating detection reset circuit has following three blocks.
• CPU operating detection circuit
• Voltage comparison circuit
• Low voltage/CPU operating detection reset control register (LVRC)
■ Block Diagram of Low Voltage/CPU Operating Detection Reset Circuit
Figure 19.2-1 Block Diagram of Low Voltage/CPU operating Detection Reset Circuit
V
CC
-
+
V
SS
Voltage comparison
circuit
Counter F/F
CPU operating detection circuit
Oscillation clock
Reserved Reserved Reserved Reserved
CL LVRF
Reserved
CPUF
Low voltage/CPU operating detection
reset control register (LVRC)
Clear
OF
Internal data bus
Fixed voltage supply
Internal reset
Noise canceler