HT45F0057 datasheet(32/81 Pages) HOLTEK

32 / 81 page

Rev. 1.30

May 17, 2022

Rev. 1.30

May 17, 2022

HT45F0057

Induction Cooker Flash MCU

HT45F0057

Induction Cooker Flash MCU

Port A has the additional capability of providing wake-up functions. When the device is in the

Power Down Mode, various methods are available to wake the device up. One of these is a high to

low transition of any of the Port A pins. Single or multiple pins on Port A can be setup to have this

function.

Timer/Event Counters

The provision of timers form an important part of any microcontroller, giving the designer a means

of carrying out time related functions. The device contains three count-up timer of 8-bit capacity.

The Timer/Event Counter 0 has three different operating modes, it can be configured to operate as a

general timer, an external event counter or as a pulse width capture device. The Timer/Event Counter

1 has only one operating mode – the PPG non-retriggered function. The Timer/Event Counter 2 has

only one operating mode which is timer mode. The provision of an internal prescaler to the clock

circuitry on gives added range to the timers.

There are two types of registers related to the Timer/Event Counters. The first are the registers that

contain the actual value of the timer and into which an initial value can be preloaded. Reading from

these registers retrieves the contents of the Timer/Event Counter. The second type of associated

registers are the Timer Control Registers which define the timer options and determines how the

timers are to be used.

Configuring the Timer/Event Counter Input Clock Source

For the Timer/Event Counter 0, the clock source can be from an external source or an internal clock

source, when selecting an external source, the choice of which is determined by the TMR0ECS bit in

the CTRL0 register, it can be from the TMR0 pin or the INT0 signal. For the Timer/Event Counter

1/2, there is only one clock source, fSYS, which is also divided by a prescaler, the division ratio is

conditioned by the Timer Control Register bits TnPSC0~TnPSC2. The external clock input allows

the user to count external events, measure time internals or pulse widths. While using the internal

clock allows the user to generate an accurate time base.

• CTRL0 Register

Bit

Name

C2VOINV TMR0ECS

—

PCKPSC

—

LVDO

LVDC

R/W

—

R/W

—

R/W

POR

—

Bit 7

C2VOINV: Inverting control of the comparator 2 output signal

Described elsewhere

Bit 6

TMR0ECS: Select TMR0 external clock source

0: TMR0 pin

1: INT0

Bit 5~4

Unimplemented, read as “0”

Bit 3

PCKPSC: Peripheral clock prescaler stage

Described elsewhere

Bit 2

Unimplemented, read as “0”

Bit 1

LVDO: Low voltage detector output

Described elsewhere

Bit 0

LVDC: Low voltage detector control

Described elsewhere

HT45F0057 Datasheet(PDF) 32 Page - Holtek Semiconductor Inc

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