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參數資料
型號: Q67127-C2036SAB-C161R1-L16M
英文描述: IC-SM-16 BIT CPU
中文描述: 集成電路的Sm - 16位CPU
文件頁數: 88/121頁
文件大小: 1000K
代理商: Q67127-C2036SAB-C161R1-L16M
Semiconductor Group
7-10
Interrupt System
C501
7.4
External Interrupts
The external interrupts 0 and 1 can be programmed to be level-activated or negative-transition
activated by setting or clearing bit IT0, respectively in register TCON. If ITx = 0 (x = 0 or 1), external
interrupt x is triggered by a detected low level at the INTx pin. If ITx = 1, external interrupt x is
negative edge-triggered. In this mode, if successive samples of the INTx pin show a high in one
cycle and a low in the next cycle, interrupt request flag IEx in TCON is set. Flag bit IEx=1 then
requests the interrupt.
If the external interrupt 0 or 1 is level-activated, the external source has to hold the request active
until the requested interrupt is actually generated. Then it has to deactivate the request before the
interrupt service routine is completed, or else another interrupt will be generated.
The external timer 2 reload trigger interrupt request flag EXF2 will be activated by a negative
transition at pin P1.1/T2EX but only if bit EXEN2 is set.
Since the external interrupt pins are sampled once in each machine cycle, an input high or low
should be held for at least 6 oscillator periods to ensure sampling. lf the external interrupt is
transition-activated, the external source has to hold the request pin high for at least one cycle, and
then hold it low for at least one cycle to ensure that the transition is recognized so that the
corresponding interrupt request flag will be set (see
figure 7-27
). The external interrupt request
flags will automatically be cleared by the CPU when the service routine is called.
Figure 7-27
External Interrupt Detection
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相關代理商/技術參數
參數描述
Q67127-C2056 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller
Q67127-C2057 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller
Q67127-C2058 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller
Q67127-C2060 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller
Q67127-C2061 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller
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