R5F211B2DSP datasheet(91/339 Pages) RENESAS

Part #	R5F211B2DSP

Description	RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER R8C FAMILY / R8C/1x SERIES

PDF	339 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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91 / 339 page

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

R5F211B2DSP Datasheet(PDF) 91 Page - Renesas Technology Corp