R8C-20_1 Datasheet, PDF (100/501 Pages) Renesas Technology Corp – MCU R8C FAMILY / R8C/2x SERIES

R8C/20 Group, R8C/21 Group
10. Clock Generation Circuit
Interrupt sources judgment
OCD3 = 1?
NO
(XIN clock stops)
YES
OCD1 = 1 (Oscillation
stop detection interrupt enable),
NO
and OCD2=1 (Selects on-chip
oscillator clock)?
YES
VW2C3 = 1?
NO
(Watchdog time underflows)
OCD1 = 0 (Oscillation stop detection
interrupt disable) ⁽¹⁾
YES
Jump to oscillation stop detection
interrupt process routine.
Jump to watchdog timer interrupt
process routine.
Jump to voltage monitor 2 Interrupt
process routine.
NOTE:
1. This disables multiple oscillation stop detection interrupts.
OCD1 to OCD3: Bits in OCD register
VW2C3: Bit in VW2C register
Figure 10.14 Example of Determining Interrupt Source for Oscillation Stop Detection, Watchdog
Timer, Voltage Monitor 1, or Voltage Monitor 2 Interrupt
Rev.2.00 Aug 27, 2008 Page 84 of 458
REJ09B0250-0200