Renesas Asynchronous SH7145F User Manual download pdf (Page 14)

SH7145 Group

SCI Break Detection

REJ06B0384-0100Z/Rev.1.00 September 2004 Page 14 of 20

5.5 CMT0 Interrupt Routine

cmt_int ()

return

Stop counting by CMT_0.

Count the number of interrupts.

Clear the CMF flag in CMCSR_0 to 0.

Count the number of times

low level is detected on the RxD pin.

Third interrupt?

No

Yes

Low level on the RxD pin?

No

Yes

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