參數(shù)資料
型號: MC68HC05RC17DW
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.097 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 67/128頁
文件大小: 4788K
代理商: MC68HC05RC17DW
Interrupts
Hardware Interrupts
MC68HC05RC17 Rev. 2.0
General Release Specification
Interrupts
NON-DISCLOSURE
AGREEMENT
REQUIRED
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 Keyscan)
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
through PB7) act as other external interrupt sources if the
pullup/interrupt feature is enabled as speci ed b y the user.
Figure 4-2. IRQ Function Block Diagram
IRQ
LATCH
R
IRQ PIN
LEVEL
(MASK OPTION)
TO IRQ
PROCESSING
IN CPU
PORT B INTERRUPT/KEYSCAN
TO BIH & BIL
INSTRUCTION
SENSING
RST
IRQ VECTOR FETCH
VDD
EIMSK
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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