Rainbow-electronics T89C51RD2 Manuel d'utilisateur télécharger pdf (Page 39)

Rev. F - 15 February, 2001 39

T89C51RD2

Table 19. IP Register

IP - Interrupt Priority Register (B8h)

Reset Value = X000 0000b

Bit addressable

7 6 5 4 3 2 1 0

- PPC PT2 PS PT1 PX1 PT0 PX0

Bit

Number

Bit

Mnemonic

Description

7 -

Reserved

The value read from this bit is indeterminate. Do not set this bit.

6 PPC

PCA interrupt priority bit

Refer to PPCH for priority level.

5 PT2

Timer 2 overﬂow interrupt Priority bit

Refer to PT2H for priority level.

4 PS

Serial port Priority bit

Refer to PSH for priority level.

3 PT1

Timer 1 overﬂow interrupt Priority bit

Refer to PT1H for priority level.

2 PX1

External interrupt 1 Priority bit

Refer to PX1H for priority level.

1 PT0

Timer 0 overﬂow interrupt Priority bit

Refer to PT0H for priority level.

0 PX0

External interrupt 0 Priority bit

Refer to PX0H for priority level.

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 85 86

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Rainbow-electronics T89C51RD2 Manuel d'utilisateur Page 39