Renesas R8C series User Manual

R8C/1A Group, R8C/1B Group 10. Clock Generation Circuit
Rev.1.30 Dec 08, 2006 Page 75 of 315
REJ09B0252-0130
Figure 10.11 Procedure for Switching Clock Source from Low-Speed On-Chip Oscillator to Main
Clock
Table 10.6 Determining Interrupt Source for Oscillation Stop Detection, Watchdog Timer, and
Voltage Monitor 2 Interrupts
Generated Interrupt Source Bit Showing Interrupt Cause
Oscillation stop detection
( (a) or (b) )
(a) OCD3 bit in OCD register = 1
(b) Bits OCD1 to OCD0 in OCD register = 11b and OCD2 bit = 1
Watchdog timer VW2C3 bit in VW2C register = 1
Voltage monitor 2 VW2C2 bit in VW2C register = 1
Determine OCD3 bit
1(main clock stops)
0 (main clock oscillates)
Set bits OCD1 to OCD0 to 00b
(oscillation stop detection function
disabled)
Set OCD2 bit to 0
(select main clock)
End
Switch to main clock
Bits OCD3 to OCD0: Bits in OCD register
Judge several times
Determine several times that the main clock is supplied

Renesas R8C series Specifications

General

Brand	Renesas
Model	R8C series
Category	Computer Hardware
Language	English