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參數資料
| 型號： | P87LPC762 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Low power, low price, low pin count 20 pin microcontroller with 2 kbyte OTP |
| 中文描述： | 低功耗，低價格，低管腳數的2字節檢察官辦公室20引腳微控制器 |
| 文件頁數： | 20/57頁 |
| 文件大小： | 312K |
| 代理商： | P87LPC762 |
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Philips Semiconductors
Preliminary data
87LPC762
Low power, low price, low pin count (20 pin)
microcontroller with 2 kbyte OTP
2001 Oct 26
17
External Interrupt Inputs
The 87LPC762 has two individual interrupt inputs as well as the
Keyboard Interrupt function. The latter is described separately
elsewhere in this section. The two interrupt inputs are identical to
those present on the standard 80C51 microcontroller.
The external sources can be programmed to be level-activated or
transition-activated by setting or clearing bit IT1 or IT0 in Register
TCON. If ITn = 0, external interrupt n is triggered by a detected low
at the INTn pin. If ITn = 1, external interrupt n is edge triggered. In
this mode if successive samples of the INTn pin show a high in one
cycle and a low in the next cycle, interrupt request flag IEn in TCON
is set, causing an interrupt request.
Since the external interrupt pins are sampled once each machine
cycle, an input high or low should hold for at least 6 CPU Clocks to
ensure proper sampling. If the external interrupt is
transition-activated, the external source has to hold the request pin
high for at least one machine cycle, and then hold it low for at least
one machine cycle. This is to ensure that the transition is seen and
that interrupt request flag IEn is set. IEn is automatically cleared by
the CPU when the service routine is called.
If the external interrupt is level-activated, the external source must
hold the request active until the requested interrupt is actually
generated. If the external interrupt is still asserted when the interrupt
service routine is completed another interrupt will be generated. It is
not necessary to clear the interrupt flag IEn when the interrupt is
level sensitive, it simply tracks the input pin level.
If an external interrupt is enabled when the 87LPC762 is put into
Power Down or Idle mode, the interrupt will cause the processor to
wake up and resume operation. Refer to the section on Power
Reduction Modes for details.
SU01158
WAKEUP
(IF IN POWER
DOWN)
EA
(FROM IEN0
REGISTER)
INTERRUPT
TO CPU
IE0
EX0
IE1
EX1
BOD
EBO
KBF
EKB
CM2
EC2
WDT
EWD
CM1
EC1
TF0
ET0
TF1
ET1
RI + TI
ES
ATN
EI2
Figure 9. Interrupt Sources, Interrupt Enables, and Power Down Wakeup Sources
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相關代理商/技術參數 |
參數描述 |
|---|---|
| P87LPC762BD | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low power, low price, low pin count 20 pin microcontroller with 2 kbyte OTP |
| P87LPC762BD,512 | 功能描述:8位微控制器 -MCU 80C51 2K/128 OTP RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 |
| P87LPC762BD512 | 制造商:NXP Semiconductors 功能描述:IC 8BIT MCU 80C51 20MHZ SOIC-20 |
| P87LPC762BDH | 功能描述:8位微控制器 -MCU 80C51 2K/128 OTP RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 |
| P87LPC762BDH,512 | 功能描述:8位微控制器 -MCU 80C51 2K/128 OTP RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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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