參數(shù)資料
型號： MC68HC705K1S
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, CDIP16
封裝： CERAMIC, DIP-16
文件頁數(shù)： 77/140頁
文件大?。?/td> 3196K
代理商： MC68HC705K1S
Interrupts
Interrupt Types
MC68HC705K1 — Rev. 2.0
Technical Data
Interrupts
4.3.2.1 IRQ/VPP Pin
An interrupt signal on the IRQ/VPP pin latches an external interrupt
request. After completing the current instruction, the CPU tests these
bits:
IRQ latch
IRQE bit in the interrupt status and control register
I bit in the condition code register
If both the IRQ latch and the IRQE bit are set, and the I bit is clear, the
CPU then begins the interrupt sequence. The CPU clears the IRQ latch
while it fetches the interrupt vector, so that another external interrupt
request can be latched during the interrupt service routine. As soon as
the I bit is cleared during the return from interrupt, the CPU can
recognize the new interrupt request. Figure 4-1 shows the logic for
external interrupts.
The IRQ/VPP pin is negative edge-triggered only or negative edge- and
low-level-triggered, depending on the state of the LEVEL bit in the mask
option register (MOR). See 9.6 Mask Option Register.
Programming the LEVEL bit to a logic 1 selects the edge- and
level-sensitive trigger option. When LEVEL = 1:
A falling edge or a low level on the IRQ/VPP pin latches an external
interrupt request.
As long as the IRQ/VPP is low, an external interrupt request is
present, and the CPU continues to execute the interrupt service
routine. The edge- and level-sensitive trigger option allows
connection to the IRQ/VPP pin of multiple wired-OR interrupt
sources.
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For More Information On This Product,
Go to: www.freescale.com
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相關PDF資料
PDF描述
MC68HC705K1DW 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PDSO16
MC68HC705K1P 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PDIP16
MC68HC705L5FU MROM, 4.2 MHz, MICROCONTROLLER, PQFP80
MC68HC05L5FU MROM, 4.2 MHz, MICROCONTROLLER, PQFP80
MC68HC705L5FU 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP80
相關代理商/技術參數(shù)
參數(shù)描述
MC68HC705KJ1CDW 功能描述:8位微控制器 -MCU 8 Bit 4MHz RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
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MC68HC705MC4CDW 制造商:Motorola 功能描述:MOTOROLA S7D9B
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