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参数资料
| 型号： | ST62P35BQ6/XXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP52 |
| 封装： | PLASTIC, QFP-52 |
| 文件页数： | 19/82页 |
| 文件大小： | 617K |
| 代理商： | ST62P35BQ6/XXX |
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ST62T35B/E35B
IINTERRUPTS (Cont’d)
3.3.2 Interrupt Procedure
The interrupt procedure is very similar to a call
procedure, indeed the user can consider the inter-
rupt as an asynchronous call procedure. As this is
an asynchronous event, the user cannot know the
context and the time at which it occurred. As a re-
sult, the user should save all Data space registers
which may be used within the interrupt routines.
There are separate sets of processor flags for nor-
mal, interrupt and non-maskable interrupt modes,
which are automatically switched and so do not
need to be saved.
The following list summarizes the interrupt proce-
dure:
MCU
– The interrupt is detected.
– The C and Z flags are replaced by the interrupt
flags (or by the NMI flags).
– The PC contents are stored in the first level of
the stack.
– The normal interrupt lines are inhibited (NMI still
active).
– The first internal latch is cleared.
– The associated interrupt vector is loaded in thePC.
WARNING: In some circumstances, when a
maskable interrupt occurs while the ST6 core is in
NORMAL mode and especially during the execu-
tion of an ”ldi IOR, 00h” instruction (disabling all
maskable interrupts): if the interrupt arrives during
the first 3 cycles of the ”ldi” instruction (which is a
4-cycle instruction) the core will switch to interrupt
mode BUT the flags CN and ZN will NOT switch to
the interrupt pair CI and ZI.
User
– User selected registers are saved within the in-
terrupt service routine (normally on a software
stack).
– The source of the interrupt is found by polling the
interrupt flags (if more than one source is asso-
ciated with the same vector).
– The interrupt is serviced.
– Return from interrupt (RETI)
MCU
– Automatically the MCU switches back to the nor-
mal flag set (or the interrupt flag set) and pops
the previous PC value from the stack.
The interrupt routine usually begins by the identi-
fying the device which generated the interrupt re-
quest (by polling). The user should save the regis-
ters which are used within the interrupt routine in a
software stack. After the RETI instruction is exe-
cuted, the MCU returns to the main routine.
Figure 16. Interrupt Processing Flow Chart
I NS TRUC TION
FETCH
IN STRU CTION
EXEC UTE
INS TRUCT ION
WAS
THE IN STRU CTION
ARE TI
?
CLEAR
I NTER RU PT MASK
SELECT
PROGRAM FLAGS
”POP”
THE STAC KED PC
?
C HEC K IF THER E IS
AN IN TERRU PT RE QUEST
AN D INT ER RU PT MASK
SELECT
INTE RN AL MODE FLAG
PUSH THE
PC I NTO THE STAC K
LOAD PC FROM
IN TERR UPT VEC TOR
(FFC/ FFD)
SET
I NTERR UP T MASK
NO
YES
I S THE COR E
ALREADY IN
NOR MAL MOD E?
VA000014
YES
NO
YES
25
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