Toshiba H1 Series - Manual (Page 71)

TMP92CZ26A
92CZ26A-68
Figure 3.5.1 Interrupt processing Sequence
Interrupt processing
Interrupt vector calue “V”
read interrupt request F/F clear
Interrupt specified
by DMA
start vector ?
PUSH PC
PUSH SR
SR<IFF2:0>
← Level of
accepted
interrupt
+ 1
INTNEST
← INTNEST + 1
PC ← (FFFF00H + V)
Interrupt processing
program
RETI instruction
POP SR
POP PC
INTNEST ← INTNEST − 1
End
Clear interrupt request flag
YES
NO
Data transfer by micro
DMA
COUNT
← COUNT − 1
COUNT
= 0
NO
Clear vector register
generating micro DMA
transfer end interrupt
(INTTC0)
YES
Micro DMA
processing
General-purpose
interrupt
processing
DMA soft start
request
Start specified
by HDMA
YES to HDMA processing flow
NO