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HC705RC16GRS/D 데이터시트(PDF) 39 Page - NXP Semiconductors

부품명 HC705RC16GRS/D
상세설명  The MC68HC705RC16 is a low-cost addition to the M68HC05 Family of microcontrollers (MCUs) and is suitable for remote control applications.
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제조업체  NXP [NXP Semiconductors]
홈페이지  http://www.nxp.com
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HC705RC16GRS/D 데이터시트(HTML) 39 Page - NXP Semiconductors

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Interrupts
Hardware Interrupts
MC68HC705RC16 — Rev. 3.0
General Release Specification
Interrupts
4.6 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. The three
types of hardware interrupts are explained in the following sections.
4.7 External Interrupt (IRQ/Port B Pullup)
The IRQ pin provides an asynchronous interrupt to the CPU. A block
diagram of the IRQ function is shown in Figure 4-2.
NOTE:
The BIH and BIL instructions will apply to the level on the IRQ pin itself
and to the output of the logic OR function with the port B IRQ interrupts.
The states of the individual port B pins can be checked by reading the
appropriate port B pins as inputs.
The IRQ pin is one source of an external interrupt. All port B pins
(PB0–PB7) act as other external interrupt sources if the pullup feature is
enabled as specified by the user.
Figure 4-2. IRQ Function Block Diagram
IRQ
LATCH
R
IRQ PIN
LEVEL
(MASK OPTION)
TO IRQ
PROCESSING
IN CPU
PORT B KEYSCAN INTERRUPT
TO BIH & BIL
INSTRUCTION
SENSING
RST
IRQ VECTOR FETCH
VDD
EIMSK
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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