參數(shù)資料
型號: MC68HC05JB4DWR2
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 64/134頁
文件大?。?/td> 1305K
代理商: MC68HC05JB4DWR2
February 24, 1999
GENERAL RELEASE SPECIFICATION
MC68HC05JB4
INTERRUPTS
MOTOROLA
REV 2
4-5
The IRQE enable bit controls whether an active IRQF ag can generate an IRQ
interrupt sequence. This interrupt is serviced by the interrupt service routine
located at the address specied by the contents of $1FFA and $1FFB.
If IRQF is set, the only way to clear this ag is by writing a logic one to the IRQR
acknowledge bit in the ICSR. As long as the output state of the IRQF ag bit is
active the CPU will continuously re-enter the IRQ interrupt sequence until the
active state is removed or the IRQE enable bit is cleared.
Figure 4-3. External Interrupt (IRQ) Logic
4.5.2 External Interrupt IRQ2
The IRQ2/PA4 pin provides an asynchronous interrupt to the CPU. When a nega-
tive-edge is detected by the schmitt trigger input, an IRQ2 interrupt will be gener-
ated if the IRQ2E-bit in the ICSR register is set. This interrupt is serviced by the
interrupt service routine located at the address specied by the contents of $1FFA
and $1FFB. A block diagram of the IRQ2 function is shown in Figure 4-4.
IRQ
LATCH
VDD
RST
IRQ VECTOR FETCH
IRQ STATUS/CONTROL REGISTER
EXTERNAL
INTERRUPT
REQUEST
IRQE
IRQF
IRQR
INTERNAL DATA BUS
TO BIH & BIL
INSTRUCTION
PROCESSING
R
IRQ Level
(Mask Option)
PA0
PA1
PA2
PA3
Port A External Interrupt
(Mask Option)
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