ST52T430 datasheet(31/88 Pages) STMICROELECTRONICS

31 / 88 page

ST52T430/E430

31/88

Figure 4.6 Example of a sequence of Interrupt requests

REMARK: The Interrupt priority must be set at

the beginning of the main program, because at

the

RESET

REG_CONF1=’00000000’,

this

condition could generate wrong operations.

Further, changing the priority levels must be

avoided in interrupt service routines.

When a source provides an Interrupt request and

the request processing is also enabled, the CU

changes the normal sequential flow of a program

by transferring program control to a selected

service routine.

When an interrupt occurs the CU executes a JUMP

instruction to the address loaded in the related

location of the Interrupt Vector.

When the execution returns to the original program

it immediately begins following the instruction that

was interrupted.

4.6 Interrupts and Low power mode

All interrupts allow the processor to leave the WAIT

low power mode. Only the external Interrupt allows

the processor to leave the HALT low power mode.

4.7 Interrupt RESET

An eventually pending interrupt can be reset with

the instruction RINT j, which resets the interrupt

j-th where j identifies the peripherals as described

in the following table (see Table 4.4).

The assembler instruction:

RINT 2

Resets the PWM/Timer 1 interrupt.

Note: The RINT command must be preceded

from a UDGI (or MDGI) command and followed

by a UEGI (or MEGI) command.

WARNING: If an interrupt is reset, with the RINT

instruction within its own interrupt routine, the

priority level of the interrupt becomes the

lowest and the routine can be immediately

interrupted

lower

priority

interrupt

request.

Table 4.4 RINT Instruction code

Peripheral Name

Value

A/D Converter

PWM/TIMER 0

PWM/TIMER 1

PWM/TIMER 2

SCI

External Interrupt

Table 4.4 RINT Instruction code

Peripheral Name

Value

MAIN PROGRAM

INT2

INT0

INT2

INT1

INT2

INT3

INT4

MAIN PROGRAM

PRIORITY

LEVEL

INT2

INT0

INT4

INT1

INT3

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