P83C266BDR datasheet(26/92 Pages) PHILIPS

26 / 92 page

1999 Mar 10

Philips Semiconductors

Product speciﬁcation

Microcontrollers for PAL/SECAM TV

with OSD and VST

P8xCx66 family

11.6

Interrupt Priority Register 0 (IP0)

Table 25 Interrupt Priority Register 0 (SFR address B8H)

Table 26 Description of IP0 bits

A logic 0 selects low priority; a logic 1 selects high priority.

11.7

Interrupt Priority Register 1 (IP1)

Table 27 Interrupt Priority Register 1 (SFR address F8H)

Table 28 Description of IP1 bits

Where PXx = 0 selects low priority; PXx = 1 selects high priority.

76543210

−−

PS1

−

PT1

PX1

PT0

PX0

BIT

SYMBOL

DESCRIPTION

−

These 2 bits are not used.

−

PS1

I2C-bus SIO interrupt priority level

−

This bit is not used.

PT1

Timer 1 interrupt priority level

PX1

external interrupt 1 priority level

PT0

Timer 0 interrupt priority level

PX0

external interrupt 0 priority level

76543210

PX9

−

PX7

PX6

PX5

PX4

PX3

PX2

BIT

SYMBOL

DESCRIPTION

PX9

enable external interrupt 9 priority level (P1.7 port line)

−

not used

PX7

enable external interrupt 7 priority level (VSYNC interrupt)

PX6

enable external interrupt 6 priority level (P1.4 port line)

PX5

enable external interrupt 5 priority level (P1.3 port line)

PX4

enable external interrupt 4 priority level (P1.2 port line)

PX3

enable external interrupt 3 priority level (P1.1 port line)

PX2

enable external interrupt 2 priority level (P1.0 port line)

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