HT45F0057 datasheet(42/88 Pages) HOLTEK

42 / 88 page

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HT45F0057

Induction Cooker Flash MCU

HT45F0057

Induction Cooker Flash MCU

Exte�nal TMR0

Pin Input

T0�N–with TMR0E = 0

P�es�ale� �utput

In��ement

Time� Counte�

Time�

P�es�ale� �utput is sampled at eve�y falling edge of T1.

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Pulse Width Capture Mode Timing Chart (TMR0E=0)

Mode 0

The Timer/Event Counter 1 has a mode 0 for PPG usage. This mode is used to implement the PPG

non-retriggered function. In this mode, the timer starts counting when PPG is stopped and stops

when overflow. That means the T1ON will be set once PPG stopped and cleared when overflow.

Once an overflow occurs, the counter is reloaded from the timer/event counter preload register, and

generates an interrupt request flag. The interrupt can be disabled by ensuring that the Timer/Event

Counter Interrupt Enable bit in the corresponding Interrupt Control Register, it is reset to zero.

Prescaler

Bits TnPSC0~TnPSC2 of the TMRnC register can be used to define a division ratio for the internal

clock source of the Timer/Event Counter enabling longer time out periods to be setup.

�-stage p�es�ale�

8-1 MUX

T1PSC�

T1PSC1

T1PSC0

T0PSC�

T0PSC1

T0PSC0

T�PSC�

T�PSC1

T�PSC0

fT0

fT1

fT�

fSYS

Prescaler

I/O Interfacing

The Timer/Event Counter, when configured to run in the event counter or pulse width capture

mode, requires the use of an external timer pin for its operation. As this pin is a shared pin it must

be configured correctly to ensure that it is setup for use as a Timer/Event Counter input pin. This is

achieved by ensuring that the mode selects bits in the Timer/Event Counter control register, either

the event counter or pulse width capture mode. Additionally the corresponding Port Control Register

bit must be set high to ensure that the pin is setup as an input. Any pull-high resistor connected to

this pin will remain valid even if the pin is used as a Timer/Event Counter input.

Programming Considerations

When configured to run in the timer mode, the internal system clock is used as the timer clock

source and is therefore synchronised with the overall operation of the microcontroller. In this mode

when the appropriate timer register is full, the microcontroller will generate an internal interrupt

signal directing the program flow to the respective internal interrupt vector. For the pulse width

capture mode, the internal system clock is also used as the timer clock source but the timer will only

HT45F0057 Datasheet(PDF) 42 Page - Holtek Semiconductor Inc

HT45F0057 Datasheet(HTML) 42 Page - Holtek Semiconductor Inc

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