HT85F2270 datasheet(113/226 Pages) HOLTEK

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Rev. 1.00

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

Comparator Interrupt

The comparator interrupts are controlled by the two internal comparators. A comparator interrupt

request will take place when the comparator interrupt request flag, CPnIF, is set, a situation

that will occur when one of the comparator output bits changes state. This will in turn cause the

comparator overall request flag, CMPF, to go high. To allow the program to branch to its respective

interrupt vector address, the global interrupt enable bit, EAL, individual comparator enable bit,

CPnIEN, and overall comparator interrupt enable bit, ECMP, must first be set. When the interrupt

is enabled, the stack is not full and the comparator inputs generate a comparator output transition,

a subroutine call to the comparator interrupt vector, will take place. When the interrupt is serviced,

the CP0IF and CP1IF bits can be examined to determine whether the interrupt was generated by

Comparator 0 or Comparator 1. In addition, the comparator output transition interrupt can be set

up by the CPICR control register. Note that the comparator overall request flag, CMPF, will be

automatically cleared, however the individual comparator interrupt request flags, CPnIF, must be

cleared by the application program. The EAL bit must be cleared by the application program to

disable other interrupts when in the interrupt routine.

CPICR Register

SFR Address: BEh

Bit

Name

CP1IF

CP1IEN

CP1P1

CP1P0

CP0IF

CP0IEN

CP0P1

CP0P0

R/W

POR

Bit 7

CP1IF: Comparator 1 Output Transition Interrupt Request Flag

0: No request

1: Interrupt request

This bit must be cleared using the application program.

Bit 6

CP1IEN: Comparator 1 Output Transition Interrupt Enable

0: Disable

1: Enable

Bit 5~4

CP1P1, CP1P0: Comparator 1 Output Transition Setting for interrupt request

00: Interrupt disabled

01: High to low

10: Low to high

11: High to low or low to high

Bit 3

CP0IF: Comparator 0 Output Transition Interrupt Request Flag

0: No request

1: Interrupt request

This bit must be cleared using the application program.

Bit 2

CP0IEN: Comparator 0 Output Transition Interrupt Enable

0: Disable

1: Enable

Bit 1~0

CP0P1, CP0P0: Comparator 0 Output Transition Setting for interrupt request

00: Interrupt disabled

01: High to low

10: Low to high

11: High to low or low to high

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