W921E840A Datasheet, PDF (38/58 Pages) Winbond – 4-BIT MICROCONTROLLER

Hold mode operation flow chart
W921E840A/W921C840
TM0 toTM3;
Serial;Comparator;
Falling change occurs at
INT0, P4.0 to P4.2
Yes
In
Hold
No
Mode?
Interrupt
No
Enable?
Yes
Interrupt
No
Enable?
Yes
INTCTx
Interrupt
No
Flag Set?
Yes
INTCTx
Interrupt
No
Flag Set?
Yes
Reset ENINT Flag and
Individual Request Flag
Execute
Interrupt Service Routine
No
HMRFx
Hold Release
Yes
Flag Set?
Reset ENINT Flag and
Individual Request Flag
Execute
Interrupt Service Routine
Hold
PC PC + 1
note: x is the corresponding flag bit of interrupt enable or hold mode release register
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