參數(shù)資料
型號: MC68HC05P18ADWE
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 48/130頁
文件大?。?/td> 1310K
代理商: MC68HC05P18ADWE
NON-DISCLOSURE
AGREEMENT
REQUIRED
General Description
Technical Data
MC68HC05P18A
General Description
1.5.9 Maskable Interrupt Request (IRQ)
This input pin drives the asynchronous interrupt function of the MCU.
The MCU completes the current instruction being executed before it
responds to the IRQ interrupt request. When IRQ is driven low, the event
is latched internally to signify an interrupt has been requested. When the
MCU completes its current instruction, the interrupt latch is tested. If the
interrupt latch is set, and the interrupt mask bit (I bit) in the condition
code register (CCR) is clear, the MCU begins the interrupt sequence.
Depending on the mask option selected, the IRQ pin triggers this
interrupt on either a negative going edge at the IRQ pin and/or while the
IRQ pin is held in the low state. In either case, the IRQ pin must be held
low for at least one tILIH time period.
If the edge- and level-sensitive mask option is selected, the IRQ input
requires an external resistor connected to VDD for a wired-OR operation.
If the IRQ pin is not used, it must be tied to the VDD supply. The IRQ pin
contains an internal Schmitt trigger as part of its input circuitry to improve
noise immunity. Refer to Section 4. Interrupts.
1.5.10 CPU Core
The MC68HC05P18A uses a standard M68HC05 series CPU core. A
description of the instruction set is in Section 12. Instruction Set.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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