14.12 Non-Maskable Interrupt Source Discrimination - Renesas M16C/64C User Manual

M16C/64C Group

14.12 Non-Maskable Interrupt Source Discrimination

The watchdog timer interrupt, oscillator stop/restart detect interrupt, voltage monitor 1 interrupt, and
voltage monitor 2 interrupt share the same interrupt vector. When using some functions together, read the
detect flags of the events in an interrupt processing program, and determine the source of the interrupt.
Table 14.13 lists Bits Used for Non-Maskable Interrupt Source Discrimination.
Table 14.13 Bits Used for Non-Maskable Interrupt Source Discrimination
Interrupt
Watchdog timer
Oscillator stop/restart
detect
Voltage monitor 1
Voltage monitor 2
R01UH0092EJ0110 Rev.1.10
Jul 31, 2012
VW2C3 bit in the VW2C register
(watchdog timer underflow detected)
CM22 bit in the CM2 register
(oscillator stop/restart detected)
VW1C2 bit in the VW1C register (Vdet1 passage detected)
VW2C2 bit in the VW2C register (Vdet2 passage detected)
Detect Flag
Bit Position
14. Interrupts
Function
0: Not detected
1: Detected
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