HT45F0057 datasheet(39/81 Pages) HOLTEK

39 / 81 page

Rev. 1.30

May 17, 2022

Rev. 1.30

May 17, 2022

HT45F0057

Induction Cooker Flash MCU

HT45F0057

Induction Cooker Flash MCU

inactive. The edge select, timer mode and clock source control bits in timer control register must

also be correctly set to ensure the timer is properly configured for the required application. It is

also important to ensure that an initial value is first loaded into the timer registers before the timer

is switched on; this is because after power-on the initial values of the timer registers are unknown.

After the timer has been initialized the timer can be turned on and off by controlling the enable bit in

the timer control register.

When the Timer/Event Counter overflows, its corresponding interrupt request flag in the interrupt

control register will be set. If the Timer/Event Counter interrupt is enabled this will in turn generate

an interrupt signal. However irrespective of whether the interrupts are enabled or not, a Timer/Event

Counter overflow will also generate a wake-up signal if the device is in a Power-down condition.

This situation may occur if the Timer/Event Counter is in the Event Counting Mode and if the

external signal continues to change state. In such a case, the Timer/Event Counter will continue to

count these external events and if an overflow occurs the device will be woken up from its Power-

down condition. To prevent such a wake-up from occurring, the timer interrupt request flag should

first be set high before issuing the “HALT” instruction to enter the Power down Mode.

Timer Program Example

This program example shows how the Timer/Event Counter registers are setup, along with how the

interrupts are enabled and managed. Note how the Timer/Event Counter is turned on, by setting bit

4 of the Timer Control Register. The Timer/Event Counter can be turned off in a similar way by

clearing the same bit. This example program sets the Timer/Event Counters to be in the timer mode,

which uses the internal system clock as their clock source.

Timer Programming Example

org 0ch

; external interrupt vector

org 14h

; Timer Counter 0 interrupt vector

jmp tmr0int

; jump here when Timer 0 overflows

org 20h

; main program

; internal Timer 0 interrupt routine

tmr0int:

; Timer 0 main program placed here

begin:

; setup Timer 0 registers

mov a, 09bh

; setup Timer 0 preload value

mov tmr0, a

mov a, 081h

; setup Timer 0 control register

mov tmr0c, a

; timer mode and prescaler set to fSYS/2 setup interrupt register

mov a, 001h

; enable master interrupt and both timer interrupts

mov intc0, a

mov a, 020h

mov intc1, a

set tmr0c.4

; start Timer 0

HT45F0057 Datasheet(PDF) 39 Page - Holtek Semiconductor Inc

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