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UPD72042 Datasheet(PDF) 71 Page - NEC

No. de pieza UPD72042
Descripción Electrónicos  LSI DEVICES FOR Inter Equipment BusTM (IEBusTM) PROTOCOL CONTROL
PDF  92 Pages
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Fabricante Electrónico  NEC [NEC]
Página de inicio  http://www.nec.com/
Logo NEC - NEC

UPD72042 Datasheet(HTML) 71 Page - NEC

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µPD72042
71
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:
1
MARC has been changedNote 3.
2
MTRQF = 1 and MARQ = 0
3
MRRQF = 1 and MARQ = 0
2. The return code in SLRC is enabled when any of conditions, 1 , 2 , or 3 , below, is satisfied:
1
SLRC has been changedNote 3.
2
STRQF = 1 and STRQ = 0
3
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?
1
0
; Program crash?
Read RCR
; See Note 1.
Is return
code in MARC
enabled?
MARC?
011
×
00
××
010
×
; Classify MARC.
RERQW
← 1
SIZEW
← RDR1
RECFW
← MARC
Is return
code in SLRC
enabled?
N
RERQW
← 1
SIZEW
← RDR2
RECFW
← SLRC
SLRC?
Y
010
×,
100
×
011
×, 101×
00
××
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
N
Y
µPD72042



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