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MB90420/5 (A) SERIES F
Table 24-3 Explanation of Function of Each Bit of Low Voltage and CPU Operation Detection Reset
Bit Name
bit 7
RESV0:
bit 6
Reserved bit
bit 5
RESV1:
bit 4
Reserved bit
bit 3
CL:
CPU operation detection
clear bit
bit 2
LVRF:
Low-voltage detection
flag bit
bit 1
RESV0:
Reserved bit
bit 0
CPUF:
CPU Operation detection
flag bit
2
MC-16LX FAMILY 16-BIT MICROCONTROLLERS HARDWARE MANUAL
Control Register
Note: Always write 0 to this bit.
Note: Always write 1 to this bit.
This bit clears the CPU operation detection circuit counter.
When 0 is written to this bit, the CPU operation detection circuit counter is
cleared.
When a drop in the power supply voltage is detected, this bit is set to 1.
At write, 0 clears this bit; 1 does not affect this bit or other bits.
An internal reset does not initialize this bit; input of an external reset initializes it.
Note: Always write 0 to this bit.
This bit is set to 1 when an overflow occurs in the CPU operation detection
function counter.
At write, 0 clears this bit; 1 does not affect this bit or other bits.
An internal reset does not initialize this bit; input of an external reset initializes it.
24-6
Function
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