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| 型號(hào)： | MC68HC705T16B |
| 廠商： | MOTOROLA INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP56 |
| 封裝： | PLASTIC, SDIP-56 |
| 文件頁(yè)數(shù)： | 59/128頁(yè) |
| 文件大?。?/td> | 734K |
| 代理商： | MC68HC705T16B |
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MOTOROLA
4-6
MC68HC05T16
RESETS AND INTERRUPTS
4
4.2.2
Software Interrupt (SWI)
The software interrupt is an executable instruction. The action of the SWI instruction is similar to
the hardware interrupts. The SWI is executed regardless of the state of the interrupt mask in the
condition code register. The service routine address is specied by the contents of memory
location $FFFC and $FFFD.
4.2.3
External Interrupt (IRQ)
The external interrupt IRQ can be software congured for “negative-edge” or “negative-edge and
level” sensitive triggering by the IRQN bit in the Multi-Function Timer register.
IRQN
1 (set)
–
Negative edge triggering for IRQ only.
0 (clear) –
Level and negative edge triggering for IRQ.
When the signal of the external interrupt pin, IRQ, satises the condition selected, an external
interrupt occurs. The actual processor interrupt is generated only if the interrupt mask bit of the
condition code register is also cleared. When the interrupt is recognized, the current state of the
processor is pushed onto the stack and the interrupt mask bit in the condition code register is set.
This masks further interrupts until the present one is serviced. The service routine address is
specied by the contents of $FFF8 & $FFF9.
The interrupt logic recognizes negative edge transitions and pulses (special case of negative
edges) on the external interrupt line. Figure 4-3 shows both a block diagram and timing for the
interrupt line (IRQ) to the processor. The rst method is used if pulses on the interrupt line are
spaced far enough apart to be serviced. The minimum time between pulses is equal to the number
of cycles required to execute the interrupt service routine plus 21 cycles. Once a pulse occurs, the
next pulse should not occur until the MCU software has exited the routine (an RTI occurs). The
second conguration shows several interrupt lines wired-OR to perform the interrupt at the
processor. Thus, if the interrupt lines remain low after servicing one interrupt, the next interrupt is
recognized.
Note:
The internal interrupt latch is cleared in the rst part of the service routine; therefore,
one (and only one) external interrupt pulse could be latched during tILIL and serviced
as soon as the I bit is cleared.
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
Multi-Function Timer Register
$1C
TOF
RTIF
TOFIE
RTIE
IRQN WDOG
RT1
RT0
0000 0011
TPG
34
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