M16C/62P Group (M16C/62P, M16C/62PT)
6. Voltage Detection Circuit
Rev.2.41
Jan 10, 2006
Page 51 of 390
REJ09B0185-0241
6.2
Limitations on Exiting Stop Mode
The low voltage detection interrupt is immediately generated and the microcomputer exits stop mode if the CM10
bit in the CM1 register is set to “1” under the conditions below.
•
the VC27 bit in the VCR2 register is set to “1” (low voltage detection circuit enabled),
•
the D40 bit in the D4INT register is set to “1” (low voltage detection interrupt enabled),
•
the D41 bit in the D4INT register is set to “1” (low voltage detection interrupt is used to exit stop mode), and
•
the voltage applied to the VCC1 pin is higher than Vdet4 (the VC13 bit in the VCR1 register is “1”)
If the microcomputer is set to enter stop mode when the voltage applied to the VCC1 pin drops below Vdet4 and to
exit stop mode when the voltage applied rises to Vdet4 or above, set the CM10 bit to “1” when VC13 bit is “0”
(VCC1 < Vdet4).
6.3
Limitations on Exiting Wait Mode
The low voltage detection interrupt is immediately generated and the microcomputer exits wait mode If WAIT
instruction is executed under the conditions below.
•
the CM02 bit in the CM0 register is set to “1” (stop peripheral function clock),
•
the VC27 bit in the VCR2 register is set to “1” (low voltage detection circuit enabled),
•
the D40 bit in the D4INT register is set to “1” (low voltage detection interrupt enabled),
•
the D41 bit in the D4INT register is set to “1” (low voltage detection interrupt is used to exit wait mode), and
•
the voltage applied to the VCC1 pin is higher than Vdet4 (the VC13 bit in the VCR1 register is “1”)
If the microcomputer is set to enter wait mode when the voltage applied to the VCC1 pin drops below Vdet4 and to
exit wait mode when the voltage applied rises to Vdet4 or above, perform WAIT instruction when VC13 bit is “0”
(VCC1 < Vdet4).
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