ST52F510 datasheet(43/106 Pages) STMICROELECTRONICS

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ST52F510/F513/F514

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Low Priority Register (INT_PRL_L)

Configuration Register 4 (04h) Read/Write

Reset Value: 1000 1000 (088h)

These three register are used to configure the

priority level of each interrupt source. The 24 bits

of these registers (PRL24-PRL0) are divided into 8

groups of three bits: each group is associated with

a priority level (from level 1, the highest, to level 8,

the lowest: level 0 is fixed for the NMI that can be

interrupted only by the TRAP) . The three bits of

each group are written with the code number

associated with the interrupt source (see Table

5.1).

PRL2-PRL1: Interrupt priority level 1 (highest)

PRL5-PRL3: Interrupt priority level 2

PRL8-PRL6: Interrupt priority level 3

PRL11-PRL9:Interrupt priority level 4

PRL14-PRL12: Interrupt priority level 5

PRL17-PRL15: Interrupt priority level 6

PRL20-PRL18: Interrupt prioritylevel 7

PRL23-PRL21: Interrupt priority level 8 (lowest)

Example: writing the code 110 into PRL8-PRL6

bits the priority level 3 is assigned to the Port A

Interrupt.

Warning: the Priority Level configuration registers

must be always configured.

PRL7

PRL6

PRL5

PRL4

PRL3

PRL2

PRL1

PRL0

Table 5.1 Interrupt sources paramethers

Interrupt Source

Priority type

PRL code

RINT code

Maskable

Vector Addresses

A/D Converter

Programmable

000

Yes

3-5 (03h-05h)

PWM/Timer 0

Programmable

001

Yes

6-8 (06h-08h)

PWM/Timer 1

Programmable

010

Yes

9-11 (09h-0Bh)

SCI

Programmable

011

Yes

12-14 (0Ch-0Eh)

SPI

Programmable

100

Yes

15-17 (0Fh-011h)

I2C Interface

Programmable

101

Yes

18-20 (012h-014h)

Port A

Programmable

110

Yes

21-23 (015h-017h)

Port B

Programmable

111

Yes

24-26 (018h-01Ah)

NMI

Fixed

27-29 (01Bh-01Dh)

TRAP

Fixed to highest

30-32 (01Eh-020h)

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