HT85F2270 datasheet(112/226 Pages) HOLTEK

112 / 226 page

Rev. 1.00

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

How byte of Interrupt Priority Register 3: IP3H

SFR Address: CFh

Bit

Name

—

PTBH

PADCH

PI�CH

PSPIH

R/W

—

R/W

POR

—

Bit 7~4

Unimplemented, read as “0”

Bit 3

PTBH: Time Base Interrupt Priority high

High order bit for Time Base Interrupt Priority level.

Bit 2

PADCH: ADC Interrupt priority high

High order bit for ADC interrupt priority level.

Bit 1

PI2CH: I2C Interrupt priority high

High order bit for I2C interrupt priority level.

Bit 0

PSPIH: SPI Interrupt priority high

High order bit for SPI interrupt priority level.

External Interrupt

The external interrupt pins are pin-shared with the I/O pins and can be configured as an external

interrupt pin if the corresponding external interrupt enable bits in the interrupt control registers

have been set. The pin must also be setup as an input by setting the corresponding bits in the

port mode register. Any pull-high resistor settings will also remain valid when the pin is used as

an external interrupt pin. When the interrupt is enabled, the stack is not full and a falling edge,

a rising edge or a high to low level transition appears on the external interrupt pin, a subroutine

call to the external interrupt vector, will take place. When the interrupt is serviced, the external

interrupt request flag will be automatically reset and the EAL bit must be cleared by the application

program to disable other interrupts.

The IT0, IT1, I2FR and I3FR bits are used to select the type of active edge that will trigger the

external interrupt for INT0, INT1, INT2 and INT3 respectively. The other external interrupts,

INT4, INT5 and INT6, are triggered with a rising edge signal.

External Interrupt Trigger Type

Ext Int

Trigger Type

Bit

INT0

Falling Edge or Low Level

TCON

IT0

INT1

Falling Edge or Low Level

TCON

IT1

INT�

Falling Edge or Rising Edge

T�CON

I�FR

INT�

Falling Edge or Rising Edge

T�CON

I�FR

INT4

Rising Edge

—

INT�

Rising Edge

—

INT6

Rising Edge

—

HT85F2270 Datasheet(PDF) 112 Page - Holtek Semiconductor Inc

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