R8CSLASH15 datasheet(66/277 Pages) RENESAS

Part #	R8C/15

Description	16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / R8C/Tiny SERIES

PDF	277 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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66 / 277 page

R8C/14 Group, R8C/15 Group

9. Clock Generation Circuit

Rev.2.10

Jan 19, 2006

Page 54 of 253

REJ09B0164-0210

Figure 9.9

Procedure of Switching Clock Source From Low-Speed On-Chip Oscillator to Main

Clock

Table 9.6

Determine Interrupt Factor of Oscillation Stop Detection, Watchdog Timer and

Voltage Monitor 2 Interrupts

Generated Interrupt Cause

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 the 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 Stop)

0(Main Clock oscillate)

Set OCD1 to OCD0 bits to “00b”

(oscillation stop detection function

disabled)

Set OCD2 bit to “0”

(select Main Clock)

End

Switch to Main clock

OCD3 to OCD0 bits: Bits in OCD register

Judge several times

Determine several times that the main clock is supplied

R8C/15 Datasheet(PDF) 66 Page - Renesas Technology Corp