參數(shù)資料
型號: MC68HC05JB3JDW
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): 78/148頁
文件大?。?/td> 1600K
代理商: MC68HC05JB3JDW
November 5, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05JB3
INTERRUPTS
MOTOROLA
REV 1
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 IRQ Control/Status Register (ICSR) - $0A
The IRQ interrupt function is controlled by the ICSR located at $000A. All unused
bits in the ICSR will read as logic zeros. The IRQF bit is cleared and IRQE bit is
set by reset.
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
ICSR
R
IRQE
0
IRQF
0
IRQPU
$000A
W
IRQR
reset:
10000000
Figure 4-4. IRQ Control and Status Register (ICSR)
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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