参数资料
型号: MC68HC05RC8P
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封装: PLASTIC, DIP-28
文件页数: 59/122页
文件大小: 445K
代理商: MC68HC05RC8P
Interrupts
Hardware Interrupts
MC68HC05RC16 — Rev. 3.0
General Release Specification
MOTOROLA
Interrupts
41
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–PB7) act as other external interrupt sources if the pullup feature is
enabled as specied 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
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