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| 型號： | AT89LP216-20SU |
| 廠商： | Atmel |
| 文件頁數(shù)： | 13/98頁 |
| 文件大?。?/td> | 0K |
| 描述： | MCU 8051 2K FLASH 20MHZ 16-SOIC |
| 產(chǎn)品培訓(xùn)模塊： | MCU Product Line Introduction |
| 標(biāo)準(zhǔn)包裝： | 46 |
| 系列： | 89LP |
| 核心處理器： | 8051 |
| 芯體尺寸： | 8-位 |
| 速度： | 20MHz |
| 連通性： | SPI，UART/USART |
| 外圍設(shè)備： | 欠壓檢測/復(fù)位，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 14 |
| 程序存儲器容量： | 2KB（2K x 8） |
| 程序存儲器類型： | 閃存 |
| RAM 容量： | 128 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.4 V ~ 5.5 V |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 包裝： | 管件 |
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20
3621E–MICRO–11/10
AT89LP216
12.1
Interrupt Response Time
The interrupt flags may be set by their hardware in any clock cycle. The interrupt controller polls
the flags in the last clock cycle of the instruction in progress. If one of the flags was set in the
preceding cycle, the polling cycle will find it and the interrupt system will generate an LCALL to
the appropriate service routine as the next instruction, provided that the interrupt is not blocked
by any of the following conditions: an interrupt of equal or higher priority level is already in prog-
ress; the instruction in progress is RETI or any write to the IE, IP, or IPH registers. Either of
these conditions will block the generation of the LCALL to the interrupt service routine. The sec-
ond condition ensures that if the instruction in progress is RETI or any access to IE, IP or IPH,
then at least one more instruction will be executed before any interrupt is vectored to. The poll-
ing cycle is repeated at the last cycle of each instruction, and the values polled are the values
that were present at the previous clock cycle. If an active interrupt flag is not being serviced
because of one of the above conditions and is no longer active when the blocking condition is
removed, the denied interrupt will not be serviced. In other words, the fact that the interrupt flag
was once active but not serviced is not remembered. Every polling cycle is new.
If a request is active and conditions are met for it to be acknowledged, a hardware subroutine
call to the requested service routine will be the next instruction executed. The call itself takes
four cycles. Thus, a minimum of five complete clock cycles elapsed between activation of an
interrupt request and the beginning of execution of the first instruction of the service routine. A
longer response time results if the request is blocked by one of the previously listed conditions. If
an interrupt of equal or higher priority level is already in progress, the additional wait time
depends on the nature of the other interrupt's service routine. If the instruction in progress is not
in its final clock cycle, the additional wait time cannot be more than 3 cycles, since the longest
are only 4 cycles long. If the instruction in progress is RETI or an access to IE or IP, the addi-
tional wait time cannot be more than 7 cycles (a maximum of three more cycles to complete the
instruction in progress, plus a maximum of 4 cycles to complete the next instruction). Thus, in a
single-interrupt system, the response time is always more than 5 clock cycles and less than
13 clock cycles. See Figures 12-1 and 12-2.
Figure 12-1. Minimum Interrupt Response Time
Figure 12-2. Maximum Interrupt Response Time
Clock Cycles
INT0
IE0
15
Instruction
LCALL
1st ISR Instr.
Cur. Instr.
Ack.
Clock Cycles
INT0
IE0
113
Instruction
RETI
4 Cyc. Instr.
LCALL
1st ISR In
Ack.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT89LP216-20XU | 功能描述:8位微控制器 -MCU SINGLE CYCLE 2K ISP FLASH 2.4-5.5V 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(shí)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(fēng)格:SMD/SMT |
| AT89LP3240-20AU | 功能描述:8位微控制器 -MCU Sngl-Cycle 8051 IND 2.4-3.6V 32K ISP FL 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(shí)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(fēng)格:SMD/SMT |
| AT89LP3240-20JU | 功能描述:8位微控制器 -MCU Sngl-Cycle 8051 IND 2.4-3.6V 32K ISP FL 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(shí)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(fēng)格:SMD/SMT |
| AT89LP3240-20MU | 功能描述:8位微控制器 -MCU Sngl-Cycle 8051 IND 2.4-3.6V 32K ISP FL 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(shí)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(fēng)格:SMD/SMT |
| AT89LP3240-20PU | 功能描述:8位微控制器 -MCU Sngl-Cycle 8051 IND 2.4-3.6V 32K ISP FL 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(shí)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(fēng)格:SMD/SMT |
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