DS80C390 datasheet(53/155 Pages) DALLAS

53 / 155 page

DS80C390 High-Speed Microcontroller User’s Guide Supplement

53 of 155

Interrupt Priority (IP)

6543

210

SFR B8h

PS1

PT2

PS0

PT1

PX1

PT0

PX0

RW-0

R=Unrestricted Read, W=Unrestricted Write, -n=Value after Reset

Bit 7

Reserved. Read data is indeterminate.

PS1

Bit 6

Serial Port 1 Interrupt. This bit controls the priority of the serial port 1

interrupt.

0 = Serial port 1 priority is determined by the natural priority order.

1 = Serial port 1 is a high priority interrupt.

PT2

Bit 5

Timer 2 Interrupt. This bit controls the priority of Timer 2 interrupt.

0 = Timer 2 is determined by the natural priority order.

1 = Timer 2 is a high priority interrupt.

PS0

Bit 4

Serial Port 0 Interrupt. This bit controls the priority of the serial port 0

interrupt.

0 = Serial port 0 priority is determined by the natural priority order.

1 = Serial port 0 is a high priority interrupt.

PT1

Bit 3

Timer 1 Interrupt. This bit controls the priority of Timer 1 interrupt.

0 = Timer 1 is determined by the natural priority order.

1 = Timer 1 is a high priority interrupt.

PX1

Bit 2

External Interrupt 1. This bit controls the priority of external interrupt 1.

0 = External interrupt 1 is determined by the natural priority order.

1 = External interrupt 1 is a high priority interrupt.

PT0

Bit 1

Timer 0 Interrupt. This bit controls the priority of Timer 0 interrupt.

0 = Timer 0 is determined by the natural priority order.

1 = Timer 0 is a high priority interrupt.

PX0

Bit 0

External Interrupt 0. This bit controls the priority of external interrupt 0.

0 = External interrupt 0 is determined by the natural priority order.

1 = External interrupt 0 is a high priority interrupt.

DS80C390 Datasheet(PDF) 53 Page - Dallas Semiconductor

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