HT85F2270 datasheet(176/226 Pages) HOLTEK

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Rev. 1.00

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

Comparator Interrupt

Each also possesses its own interrupt function. When any one of the changes state, its relevant

interrupt flag will be set, and if the corresponding interrupt enable bit is set, then a jump to its

relevant interrupt vector will be executed. Note that it is the changing state of the CP0OUT or

CP1OUT bit and not the output pin which generates an interrupt. If the microcontroller is in the

Power-Down or IDLE Mode and the Comparator is enabled, then if the external input lines cause

the Comparator output to change state, the resulting generated interrupt flag will also generate a

wake-up. If it is required to disable a wake-up from occurring, then the interrupt function should

be disabled before entering the Power-Down or IDLE Mode. Each of the comparators has the

compare output transition settings to decide the interrupt request conditions. There are three

options, compare output rising, falling or both rising and falling conditions, decided by the CPnP1

and CPnP0 bits in the CPICR register.

Comparator Reset Function

Comparator 0 has the ability to reset the device. The reset function of Comparator 0 can be enabled

or disabled by the CP0RST bit in the CP0CR register after which the comparator polarity which

will reset the device can be selected using the CP0RSTL bit.

Programming Considerations

If the comparator is enabled, it will remain active when the microcontroller enters the Power-

Down or IDLE Mode, however as it will consume a certain amount of power, the user may wish

to consider disabling it before the Power-Down or IDLE Mode is entered. As comparator pins

are shared with normal I/O pins the I/O registers for these pins will be read as zero (port control

function is enabled.

HT85F2270 bảng dữ liệu(PDF) 176 Page - Holtek Semiconductor Inc