UPD72042 datasheet(71/92 Pages) NEC

71 / 92 page

µPD72042

Data Sheet S14870EJ1V0DS00

Fig. 6-3

Flow of Interrupt Routine

Notes 1. The return code in MARC is enabled when any of conditions, 1 , 2 , or 3 , below, is satisfied:

MARC has been changedNote 3.

MTRQF = 1 and MARQ = 0

MRRQF = 1 and MARQ = 0

2. The return code in SLRC is enabled when any of conditions, 1 , 2 , or 3 , below, is satisfied:

SLRC has been changedNote 3.

STRQF = 1 and STRQ = 0

SLREF = 1 and SLRE = 0

3. When MARC is 0001 or 0101, the same value may be generated consecutively, such that MARC is set

to 1111 to enable the detection of a change in MARC the next time it is generated. When SLRC is 0001,

0101, or 1001, it is again set to 1111 for the same reason.

Start

Disable interrupts from

Read FLG

RAW?

; Program crash?

Read RCR

; See Note 1.

Is return

code in MARC

enabled?

MARC?

011

××

010

; Classify MARC.

RERQW

← 1

SIZEW

← RDR1

RECFW

← MARC

Is return

code in SLRC

enabled?

RERQW

← 1

SIZEW

← RDR2

RECFW

← SLRC

SLRC?

010

×,

100

011

×, 101×

××

TRCF

← SLRC

TRRQ

← 1

Enable interrupts from

End

RETI

; Initialize RERQ.

; Initialize SIZE.

; Classify SLRC.

; See Note 2.

; Initialize RERQ.

; Initialize SIZE.

RAWF

← 1

TRCF

← MARC

TRRQ

← 1

Increment PW

RERQW

← 0

SIZEW

← 0

RERQW

← 1

SIZEW

← RDR1

RECFW

← MARC

RERQW

← 1

SIZEW

← RDR2

RECFW

← SLRC

REEN

← 1

Increment PW

RERQW

← 0

SIZEW

← 0

µPD72042

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