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131
CHAPTER 7 INTERRUPT
7.4.2
Processing for Interrupt Operation
When an interrupt request is generated by the peripheral function, the interrupt
controller transmits the interrupt level to the CPU. If the CPU is able to accept interrupt,
the interrupt controller temporarily interrupts the instruction currently being executed.
The interrupt controller then executes the interrupt processing routine or activates the
extended intelligent I/O service (EI
2
OS).
If a software interrupt is generated by the INT instruction, the interrupt processing
routine is executed regardless of the CPU status. In this case, hardware interrupt is not
allowed.
■
Processing for Interrupt Operation
Figure 7.4-3 shows the flow of processing for interrupt operation.
Figure 7.4-3 Flow of Interrupt Processing
S
TART
M
a
in progr
a
m
YE
S
YE
S
YE
S
YE
S
Interr
u
pt
a
ctiv
a
tion/ret
u
rn proce
ss
ing
YE
S
YE
S
NO
NO
NO
NO
NO
EI
2
O
S
S
oftw
a
re inter-
r
u
pt/exception
proce
ss
ing
H
a
rdw
a
re
in
s
tr
u
ction
EI
2
O
S
proce
ss
ing
Ret
u
rn
proce
ss
ing
I&IF&IF=1
AND
LM>IL
INT
in
s
tr
u
ction?
I
S
E = 1
RETI
in
s
tr
u
ction?
S
pecified
co
u
nt termin
a
ted? Alter-
n
a
tively, i
s
there
a
termin
a
tion
re
qu
e
s
t from the peripher
a
l
f
u
nction?
Fetch the next in
s
tr
u
ction
a
nd deode
Exec
u
te ordin
a
ry in
s
tr
u
ction
(incl
u
ding interr
u
pt proce
ss
ing)
Repetition
of
s
tring type* in
s
tr
u
ction
completed?
Move the pointer to the next
in
s
tr
u
ction
b
y PC
u
pd
a
te
Ret
u
rn the dedic
a
ted
regi
s
ter
s
from the
s
y
s
tem
s
t
a
ck, c
a
ll the interr
u
pt
ro
u
tine,
a
nd ret
u
rn to the
previo
us
ro
u
tine
I <- 0 (Di
sab
le h
a
rdw
a
re
interr
u
pt
s
)
PCB, PC <- interr
u
pt
vector (Br
a
nch to the
interr
u
pt proce
ss
ing ro
u
tine)
S
<- 1 (Activ
a
te
s
the
s
y
s
tem
s
t
a
ck)
ILM <- IL (Tr
a
n
s
fer the
interr
u
pt level of the
a
ccepted
interr
u
pt re
qu
e
s
t to the ILM)
Sa
ve the dedic
a
ted
regi
s
ter
s
to the
s
y
s
tem
s
t
a
ck
Sa
ve the dedic
a
ted regi
s
ter
s
to the
s
y
s
tem
s
t
a
ck
S
tring type*
in
s
tr
u
ction in
progre
ss
*: When
a
s
tring type in
s
tr
u
ction i
s
b
eing exec
u
ted, the interr
u
pt i
s
ev
a
l
ua
ted in e
a
ch
s
tep.
I: Interr
u
pt en
ab
le fl
a
g of the condition code regi
s
ter (CCR)
IF: Interr
u
pt re
qu
e
s
t fl
a
g of the peripher
a
l f
u
nction
IE: Interr
u
pt en
ab
le fl
a
g of the peripher
a
l f
u
nction
ILM: Interr
u
pt level m
as
k regi
s
ter (in the P
S
)
I
S
E: EI²O
S
en
ba
le fl
a
g ofthe interr
u
ptor control regi
s
ter (ICR)
IL: Interr
u
pt level
s
etting
b
it of the interr
u
pt control regi
s
ter (ICR)
S
:
S
t
a
ck fl
a
g of the condition code regi
s
ter (CCR)
PCB: Progr
a
m
ba
nk regi
s
ter
PC: Progr
a
m co
u
nter:
Содержание MB90460 Series
Страница 1: ...The following document contains information on Cypress products ...
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Страница 9: ...iv ...
Страница 41: ...22 CHAPTER 1 OVERVIEW ...
Страница 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
Страница 83: ...64 CHAPTER 3 CPU ...
Страница 95: ...76 CHAPTER 4 RESET ...
Страница 107: ...88 CHAPTER 5 CLOCK ...
Страница 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Страница 175: ...156 CHAPTER 7 INTERRUPT ...
Страница 181: ...162 CHAPTER 8 MODE SETTING ...
Страница 223: ...204 CHAPTER 9 I O PORT ...
Страница 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Страница 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Страница 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Страница 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Страница 485: ...466 CHAPTER 16 PWC Timer ...
Страница 531: ...512 CHAPTER 17 UART ...
Страница 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Страница 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Страница 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Страница 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Страница 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
Страница 715: ...696 APPENDIX ...
Страница 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
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