HT45F0057 datasheet(67/88 Pages) HOLTEK

67 / 88 page

Rev. 1.00

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HT45F0057

Induction Cooker Flash MCU

HT45F0057

Induction Cooker Flash MCU

It is recommended that programs do not use the “CALL” instruction within the interrupt service

subroutine. Interrupts often occur in an unpredictable manner or need to be serviced immediately.

If only one stack is left and the interrupt is not well controlled, the original control sequence will be

damaged once a CALL subroutine is executed in the interrupt subroutine.

Every interrupt has the capability of waking up the microcontroller when it is in Power down Mode,

the wake up being generated when the interrupt request flag changes from low to high. If it is

required to prevent a certain interrupt from waking up the microcontroller then its respective request

flag should be first set high before enter Power down Mode.

As only the Program Counter is pushed onto the stack, then when the interrupt is serviced, if the

contents of the accumulator, status register or other registers are altered by the interrupt service

program, their contents should be saved to the memory at the beginning of the interrupt service

routine.

Low Voltage Detector – LVD

Each device has a Low Voltage Detector function, also known as LVD. This enabled the device to

monitor the power supply voltage, VDD, and provide a warning signal should it fall below a certain

level. This function may be especially useful in battery applications where the supply voltage will

gradually reduce as the battery ages, as it allows an early warning battery low signal to be generated.

The Low Voltage Detector also has the capability of generating an interrupt signal.

LVD Register

LVD function can be enabled or disabled by configuration option. If the LVD configuration option

is enabled, the user can use LVDC bit in system control register 0 to enable/disable the LVD circuit

and read the LVD detector status from LVDO bit in system control register 0. The LVD voltage

is fixed at 4.4V. The device also provides an interrupt for low voltage detection, see the section of

interrupt for the details. In the power down mode, the LVD function will be disabled.

CTRL0 Register

Bit

Name

C�V�INV TMR0ECS

—

PCKPSC

—

LVD�

LVDC

R/W

—

R/W

—

R/W

P�R

—

Bit 7

C2VOINV: Inverting control of the comparator 2 output signal

Described elsewhere

Bit 6

TMR0ECS: Select TMR0 external clock source

Described elsewhere

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

0: Normal voltage

1: Low voltage detected

Bit 0

LVDC: Low voltage detector control

0: Disable

1: Enable

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