W741C260 Datasheet, PDF (17/92 Pages) Winbond – 4-BIT MICROCONTROLLER

W741C260
Hold Mode Operation
In hold mode, all operations of the µC cease, except for the operation of the oscillator, timer, divider
and LCD driver. The µC enters hold mode when the HOLD instruction is executed. The hold mode
can be released in one of five ways: by the action of timer 0, timer 1, divider 0, divider 1 or the RC
port. Before the device enters the hold mode, the HEF, PEF, and IEF flags must be set to define the
hold mode release conditions. For more details, refer to the instruction-set table and the following flow
chart.
Divider 0, Divider 1,Timer 0
Timer1, Signal Change on
Port RC
Yes
Interrupt
Enable?
Yes
IEF
Flag Set?
Yes
No
No
In
No
HOLD
Mode?
No
Interrupt
Enable?
Yes
IEF
No
Flag Set?
Yes
Reset EVF.n Flag
Execute
Interrupt Service Routine
HEF
Flag Set?
Reset EVF.n Flag
Execute
Interrupt Service Routine
(Note)
No
Yes
(Note)
Disable interrupt
Disable interrupt
HOLD
PC <- (PC+1)
Note : The bit of EVF corresponding to the interrupt request signal will be reset.
Figure 8. Hold Mode and Interrupt Operation Flow Chart
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Publication Release Date: March 1998
Revision A3