TMP19A71CYFG datasheet(21/402 Pages) TOSHIBA

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TMP19A71

3.4.4

When the SYNC Instruction Is Invalidated by an Interrupt

Even if the SYNC instruction is inserted to prevent possible problems as described in the

above examples, the SYNC instruction may be invalidated by an interrupt. The following

shows such a case occurring in the above example 2 (exiting standby mode).

Example 4: An interrupt invalidating the SYNC instruction

(Problem example)

ori

r26, r0, 0x0d

lui

r27, hi(TB0RUN)

r26, lo(TB0RUN)(r27)

; Bit0 (TRUN) = 1 (timer start)

sync

; Stall until the timer starts counting.

; Omitted

; <---An interrupt occurs here. ----

lui

r27, hi(TB0RUN)

r26, lo(TB0RUN)(r27)

; Save TB0RUN on the stack.

r0 , lo(TB0RUN)(r27)

; Bit 0 (TRUN) = 0 (timer stop)

(Required processing)

r26, lo(TB0RUN)(r27)

; Restore TB0RUN (timer restart).

ERET

; Omitted

; <---End of interrupt service routine----

wait

; Enter standby mode

nop

This problem can be avoided by inserting the SYNC instruction at the end of the

interrupt service routine (immediately before the ERET instruction).

TMP19A71 3-8

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