參數(shù)資料
型號(hào)： MC68HC705CL48
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 1.802 MHz, MICROCONTROLLER, PQFP112
封裝： TQFP-112
文件頁數(shù)： 75/145頁
文件大?。?/td> 673K
代理商： MC68HC705CL48
June 11, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05CL48
INTERRUPTS
MOTOROLA
REV 2.0
4-3
4.1
RESET INTERRUPT SEQUENCE
The RESET function is not in the strictest sense an interrupt; however, it is acted
upon in a similar manner as shown in Figure 4-1. A low level input on the RESET
pin or internal generated reset signal causes the program to vector to its starting
address which is specied by the contents of memory locations $FFFE and
$FFFF. The I-bit in the condition code register is also set. The MCU is congured
to a known state during this type of reset as described in Section 5.
4.2
SOFTWARE INTERRUPT (SWI)
The SWI is an executable instruction and a non-maskable interrupt since it is
executed regardless of the state of the I-bit in the CCR. If the I-bit is zero
(interrupts enabled), the SWI instruction executes after interrupts which were
pending before the SWI was fetched, or before interrupts if interrupts were
generated after the SWI was fetched. The interrupt service routine address is
specied by the contents of memory locations $FFFC and $FFFD.
4.3
HARDWARE INTERRUPTS
All hardware interrupts except RESET are maskable by the I-bit in the CCR. If the
I-bit is set, all hardware interrupts (internal and external) are disabled. Clearing
the I-bit enables the hardware interrupts. There are six types of hardware
interrupts which are explained in the following sections.
4.3.1 External Interrupt (IRQ)
If the IRQ option is both level and edge sensitive triggering (INTO=0), a low level
or an negative edge at the IRQ pin and the interrupt mask bit of the condition code
register is cleared will cause an EXTERNAL Interrupt to occur. If the MCU has
nished with the interrupt service routine, but the IRQ pin is still low, the
EXTERNAL Interrupt will start again. In fact, the MCU will keep on servicing the
EXTERNAL Interrupt as long as the IRQ pin is low. If the IRQ pin goes low for a
while and resumes to high (a negative pulse) before the interrupt mask bit is
cleared, the MCU will not recognize there was an interrupt request, and no
interrupt will occur after the interrupt mask bit is cleared, i.e. there is no latch for
the interrupt signal for the level sensitive triggering.
If the IRQ option is negative edge sensitive triggering (INTO=1), a negative edge
occurs at the IRQ pin and the interrupt mask bit of the condition code register is
cleared will cause an EXTERNAL Interrupt to occur. If the MCU has nished with
the interrupt service routine, but the IRQ pin has not resumed back to high, no
further interrupt will be generated. The interrupt logic recognizes negative edge
transitions and pulses (special case of negative edges) only. If the negative edge
occurs during the interrupt mask bit is set, the interrupt signal will be latched, an
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