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| 型号： | ST52T430K3T6 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 20 MHz, MICROCONTROLLER, PQFP32 |
| 封装： | TQFP-32 |
| 文件页数： | 25/88页 |
| 文件大小： | 1162K |
| 代理商： | ST52T430K3T6 |
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ST52T430/E430
31/88
Figure 4.6 Example of a sequence of Interrupt requests
REMARK: The Interrupt priority must be set at
the beginning of the main program, because at
the
RESET
REG_CONF1=’00000000’,
this
condition could generate wrong operations.
Further, changing the priority levels must be
avoided in interrupt service routines.
When a source provides an Interrupt request and
the request processing is also enabled, the CU
changes the normal sequential flow of a program
by transferring program control to a selected
service routine.
When an interrupt occurs the CU executes a JUMP
instruction to the address loaded in the related
location of the Interrupt Vector.
When the execution returns to the original program
it immediately begins following the instruction that
was interrupted.
4.6 Interrupts and Low power mode
All interrupts allow the processor to leave the WAIT
low power mode. Only the external Interrupt allows
the processor to leave the HALT low power mode.
4.7 Interrupt RESET
An eventually pending interrupt can be reset with
the instruction RINT j, which resets the interrupt
j-th where j identifies the peripherals as described
in the following table (see Table 4.4).
The assembler instruction:
RINT 2
Resets the PWM/Timer 1 interrupt.
Note: The RINT command must be preceded
from a UDGI (or MDGI) command and followed
by a UEGI (or MEGI) command.
WARNING: If an interrupt is reset, with the RINT
instruction within its own interrupt routine, the
priority level of the interrupt becomes the
lowest and the routine can be immediately
interrupted
by
a
lower
priority
interrupt
request.
Table 4.4 RINT Instruction code
Peripheral Name
Value
A/D Converter
0
PWM/TIMER 0
1
PWM/TIMER 1
2
PWM/TIMER 2
3
SCI
4
External Interrupt
5
Table 4.4 RINT Instruction code
Peripheral Name
Value
MAIN PROGRAM
5
4
3
2
1
0
INT2
INT0
INT2
INT1
INT2
INT3
INT4
MAIN PROGRAM
PRIORITY
LEVEL
INT2
INT0
INT4
INT1
INT3
6
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