r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 172

• Manufacturer Part Number: r5f21346mnfp
• Description: Single-chip Mcus Incorporates The R8c Cpu Core
• Manufacturer: Renesas Electronics Corporation.

R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
Figure 9.10
To oscillation stop detection
(oscillation stop detection
interrupt disabled)
Note:
OCD1 to OCD3: Bits in OCD register
VW2C2, VW2C3: Bits in VW2C register
Set OCD1 bit to 0
Interrupt sources
(XIN clock stops)
Determination of
interrupt routine
1. This disables multiple oscillation stop detection interrupts.
OCD3 = 1?
YES
Timer, Voltage Monitor 1, or Voltage Monitor 2 Interrupt
Example of Determining Interrupt Sources for Oscillation Stop Detection, Watchdog
(1)
NO
interrupt enabled) and OCD2 = 1
selected as system clock)?
(oscillation stop detection
(on-chip oscillator clock
OCD1 = 1
YES
NO
(watchdog timer underflow)
To watchdog timer
interrupt routine
VW2C3 = 1?
YES
NO
To voltage monitor 2
interrupt routine
(Vdet2 passed)
VW2C2 = 1?
YES
9. Clock Generation Circuit
NO
To voltage monitor 1
interrupt routine
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