R8C2K datasheet(110/471 Pages) RENESAS

Part #	R8C2K

Description	RENESAS MCU R8C FAMILY / R8C/2x SERIES

PDF	471 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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110 / 471 page

R8C/2K Group, R8C/2L Group

10. Clock Generation Circuit

Rev.1.10

Dec 21, 2007

Page 93 of 450

REJ09B0406-0110

Figure 10.14

Procedure for Switching Clock Source from Low-Speed On-Chip Oscillator to XIN

Clock

Table 10.6

Determining Interrupt Source for Oscillation Stop Detection, Watchdog Timer,

Voltage Monitor 1, 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) OCD1 to OCD0 bits in OCD register = 11b and OCD2 bit = 1

Watchdog timer

VW2C3 bit in VW2C register = 1

Voltage monitor 1

VW1C2 bit in VW1C register = 1

Voltage monitor 2

VW2C2 bit in VW2C register = 1

OCD3 to OCD0: Bits in OCD register

Switch to XIN clock

Multiple confirmations

that OCD3 bit is set to 0 (XIN

clock oscillates) ?

Set OCD1 to OCD0 bits to 00b

Set OCD2 bit to 0

(select XIN clock)

End

YES

R8C2K Datasheet(PDF) 110 Page - Renesas Technology Corp