HT85F2240 datasheet(87/147 Pages) HOLTEK

87 / 147 page

Rev. 1.10

87 of 147

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A/D Flash 8051 Core Low Pin Count MCU

HT85F2230/HT85F2240

Priority Control Registers

Low byte of Interrupt Priority Register 0: IP0

SFR Address: B8h

Bit

Name

—

WDTS

PT�

—

PT1

PX1

PT0

PX0

R/W

—

R/W

—

R/W

POR

—

Bit 7

Unimplemented, read as “0”

Bit 6

WDTS: Watchdog timer reset indication flag

Described elsewhere

Bit 5

PT2: Timer 2 Interrupt priority low

Low order bit for Timer 2 interrupt priority level.

Bit 4

Unimplemented, read as “0”

Bit 3

PT1: Timer 1 Interrupt priority low

Low order bit for Timer 1 interrupt priority level.

Bit 2

PX1: External interrupt 1 priority low

Low order bit for External Interupt 1 interrupt priority level.

Bit 1

PT0: Timer 0 Interrupt priority low

Low order bit for Timer 0 interrupt priority level.

Bit 0

PX0: External interrupt 0 priority low

Low order bit for External Interupt 0 interrupt priority level.

High byte of Interrupt Priority Register 0: IP0H

SFR Address: B9h

Bit

Name

—

PT�H

—

PT1H

PX1H

PT0H

PX0H

R/W

—

R/W

—

R/W

POR

—

Bit 7~6

Unimplemented, read as “0”

Bit 5

PT2H: Timer 2 Interrupt priority high

High order bit for Timer 2 interrupt priority level.

Bit 4

Unimplemented, read as “0”

Bit 3

PT1H: Timer 1 Interrupt priority high

High order bit for Timer 1 interrupt priority level.

Bit 2

PX1H: External interrupt 1 priority high

High order bit for External Interupt 1 interrupt priority level.

Bit 1

PT0H: Timer 0 Interrupt priority high

High order bit for Timer 0 interrupt priority level.

Bit 0

PX0H: External interrupt 0 priority high

High order bit for External Interupt 0 interrupt priority level.

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