ST52T400 datasheet(41/94 Pages) STMICROELECTRONICS

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ST52T400/T440/E440/T441

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gram, the flags are restored and the program con-

tinues from the instruction immediately following

the interrupted instruction.

4.6 Interrupts and Low power mode

All interrupts allow the processor to leave WAIT

mode. Only an External Interrupt request allows

the processor to leave HALT mode: if the interrupt

is masked, the related interrupt routine is not ser-

viced and the program continues from the first

instruction after the HALT instruction.

4.7 Interrupt RESET

When an interrupt request is sent but the interrupt

is masked, it isn’t serviced and remains pending,

so that when the interrupt is enabled it is serviced

immediately. In order to avoid this from happen-

ing, the pending interrupt request can be reset

with the instruction RINT

, which resets the

interrupt

j-th where j identify the peripherals as

described in the following table (see Table 4.4).

The assembler instruction:

RINT 2

Resets the TRIAC/PWM_F interrupt.

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 by

a lower priority interrupt request.

(*) Not Used in ST52x400 devices

Figure 4.6 Example of a sequence of Interrupt Requests

Table 4.4 RINT Instruction Code

Peripheral Name

Value

Analog Comparator (*)

PWM/TIMER

TRIAC/F

INT_TRIAC/R

INT_TRIAC/P

External Interrupt

MAIN PROGRAM

INT2

INT0

INT2

INT1

INT2

INT3

INT4

MAIN PROGRAM

PRIORITY

LEVEL

INT2

INT0

INT4

INT1

INT3

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