IBM MiEM78P468L, MiEM78P468N Bit Microcontroller WDT Setting Flowchart, TCC Setting Flowchart

EM78P468N/EM78P468L

8-Bit Microcontroller

WDT Setting Flowchart

START

N

Use WDT function ?

Y

Enable WDT function : set bit 7 of Code option Word 0 to "0"

Setting WDT prescaler

(IOC81 register)

Disable WDT function : set bit 7 of Code option Word 0 to "1"

WDTtime= prescaler*256/Fs

Fs: sub-oscillator frequency

Enable WDT

(bit 3 of IOC81)

END

TCC Setting Flowchart

START

from External Input

TCC clock source?

External/ instruction cycle

*set clock source from external TCC pin (set bit 4 of IOC71 to "1")

*set P5.6/TCC for TCC input Pin

( set bit 2 of RE to "1" and set bit 6 of IOC 50 to "1")

*choose TCC pin operation edge (set by bit 4 of IOC71)

*choose TCC prescaler

(set by bit 0 to bit 3 of IOC71)

*Enable TCC interrupt Mask (set bit 0 of IOCF0 to "1")

*Clear TCC interrupt Flag (set bit 0 of RF to "0")

from Instruction Cycle

*choose TCC clock source from instruction cycle (set bit 4 of IOC71 to "0")

*choose TCC prescaler

(set by bit 0 to bit 3 of IOC71)

	Enable TCC to start count
	(use ENI instruction)
	END
24 •		Product Specification (V1.5) 02.15.2007

(This specification is subject to change without further notice)