W741E260 Datasheet, PDF (24/94 Pages) Winbond – 4-BIT FLASH MICROCONTROLLER

W741E260
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, 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, Timer 1, Signal Change
at RC Port
Yes
Interrupt
Enable?
Yes
IEF
Flag Set?
Yes
Reset EVF Flag
Execute
Interrupt Service
Routine
(Note)
No
No
No
In
HOLD
Mode?
HEF
Flag Set?
No
Interrupt
No
Enable?
Yes
IEF
No
Flag Set?
Yes
Reset EVF Flag
Execute
Interrupt Service
Routine
Yes
(Note)
Disable interrupt
Disable interrupt
HOLD
Note: The bit of EVF corresponding to the interrupt signal will be reset.
PC <- (PC+1)
Figure 11. Hold Mode and Interrupt Operation Flow Chart
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