P80C31UFAA datasheet(18/38 Pages) PHILIPS

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Philips Semiconductors

Product specification

80C51/87C51/80C31

80C51 8-bit microcontroller family

4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V),

low power, high speed (33 MHz)

2000 Jan 20

PX0

IP (0B8H)

Priority Bit = 1 assigns higher priority

Priority Bit = 0 assigns lower priority

BIT

SYMBOL

FUNCTION

IP.7

—

Not implemented, reserved for future use.

IP.6

—

Not implemented, reserved for future use.

IP.5

PT2

Timer 2 interrupt priority bit.

IP.4

Serial Port interrupt priority bit.

IP.3

PT1

Timer 1 interrupt priority bit.

IP.2

PX1

External interrupt 1 priority bit.

IP.1

PT0

Timer 0 interrupt priority bit.

IP.0

PX0

External interrupt 0 priority bit.

SU00572

PT0

PX1

PT1

PT2

—

Figure 11. IP Registers

PX0H

IPH (B7H)

Priority Bit = 1 assigns higher priority

Priority Bit = 0 assigns lower priority

BIT

SYMBOL

FUNCTION

IPH.7

—

Not implemented, reserved for future use.

IPH.6

—

Not implemented, reserved for future use.

IPH.5

PT2H

Timer 2 interrupt priority bit high.

IPH.4

PSH

Serial Port interrupt priority bit high.

IPH.3

PT1H

Timer 1 interrupt priority bit high.

IPH.2

PX1H

External interrupt 1 priority bit high.

IPH.1

PT0H

Timer 0 interrupt priority bit high.

IPH.0

PX0H

External interrupt 0 priority bit high.

SU01058

PT0H

PX1H

PT1H

PSH

PT2H

—

Figure 12. IPH Registers

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