SC87C51UBPN View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

SC87C51UBPN

80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless low voltage (2.7V–5.5V), low power, high speed (33 MHz)

Philips Electronics 

Philips Semiconductors

80C51 8-bit microcontroller family

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

low power, high speed (33 MHz)

Product specification

80C51/87C51/80C31

IP (0B8H)

7

6

5

4

3

2

—

—

PT2

PS

PT1 PX1

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

PS

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.

Figure 11. IP Registers

1

0

PT0 PX0

SU00572

IPH (B7H)

7

6

5

4

3

2

1

0

—

— PT2H PSH PT1H PX1H PT0H PX0H

BIT

IPH.7

IPH.6

IPH.5

IPH.4

IPH.3

IPH.2

IPH.1

IPH.0

Priority Bit = 1 assigns higher priority

Priority Bit = 0 assigns lower priority

SYMBOL

—

—

PT2H

PSH

PT1H

PX1H

PT0H

PX0H

FUNCTION

Not implemented, reserved for future use.

Not implemented, reserved for future use.

Timer 2 interrupt priority bit high.

Serial Port interrupt priority bit high.

Timer 1 interrupt priority bit high.

External interrupt 1 priority bit high.

Timer 0 interrupt priority bit high.

External interrupt 0 priority bit high.

Figure 12. IPH Registers

SU01058

2000 Jan 20

18

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