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參數(shù)資料
| 型號： | C8051F531A-IT |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 219/220頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC 8051 MCU 8K FLASH 20TSSOP |
| 產(chǎn)品培訓(xùn)模塊： | Serial Communication Overview |
| 標(biāo)準(zhǔn)包裝： | 74 |
| 系列： | C8051F53x |
| 核心處理器： | 8051 |
| 芯體尺寸： | 8-位 |
| 速度： | 25MHz |
| 連通性： | SPI，UART/USART |
| 外圍設(shè)備： | 欠壓檢測/復(fù)位，POR，PWM，溫度傳感器，WDT |
| 輸入/輸出數(shù)： | 16 |
| 程序存儲器容量： | 8KB（8K x 8） |
| 程序存儲器類型： | 閃存 |
| RAM 容量： | 256 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 1.8 V ~ 5.25 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 16x12b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 125°C |
| 封裝/外殼： | 20-TSSOP（0.173"，4.40mm 寬） |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 622 (CN2011-ZH PDF) |
| 配用： | 336-1488-ND - KIT DEV C8051F53XA, C8051F52XA 336-1457-ND - ADAPTER PROG TOOLSTICK F530TPP 336-1456-ND - ADAPTER PROG TOOLSTICK F530MPP |
| 其它名稱： | 336-1496-5 |
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C8051F52x/F53x
98
Rev. 1.4
10. Interrupt Handler
The C8051F52x/F52xA/F53x/F53xA family includes an extended interrupt system with two selectable pri-
ority levels. The allocation of interrupt sources between on-chip peripherals and external input pins varies
according to the specific version of the device. Each interrupt source has one or more associated interrupt-
pending flag(s) located in an SFR. When a peripheral or external source meets a valid interrupt condition,
the associated interrupt-pending flag is set to logic 1.
If interrupts are enabled for the source, an interrupt request is generated when the interrupt-pending flag is
set. As soon as execution of the current instruction is complete, the CPU generates an LCALL to a prede-
termined address to begin execution of an interrupt service routine (ISR). Each ISR must end with an RETI
instruction, which returns program execution to the next instruction that would have been executed if the
interrupt request had not occurred. If interrupts are not enabled, the interrupt-pending flag is ignored by the
hardware and program execution continues as normal. (The interrupt-pending flag is set to logic 1 regard-
less of the interrupt's enable/disable state.)
Each interrupt source can be individually enabled or disabled through the use of an associated interrupt
enable bit in the Interrupt Enable and Extended Interrupt Enable SFRs. However, interrupts must first be
globally enabled by setting the EA bit (IE.7) to logic 1 before the individual interrupt enables are recog-
nized. Setting the EA bit to logic 0 disables all interrupt sources regardless of the individual interrupt-
enable settings. Note that interrupts which occur when the EA bit is set to logic 0 will be held in a pending
state, and will not be serviced until the EA bit is set back to logic 1.
Some interrupt-pending flags are automatically cleared by the hardware when the CPU vectors to the ISR.
However, most are not cleared by the hardware and must be cleared by software before returning from the
ISR. If an interrupt-pending flag remains set after the CPU completes the return-from-interrupt (RETI)
instruction, a new interrupt request will be generated immediately and the CPU will re-enter the ISR after
the completion of the next instruction.
10.1. MCU Interrupt Sources and Vectors
The C8051F52x/F52xA/F53x/F53xA MCUs support 15 interrupt sources. Software can simulate an inter-
rupt by setting any interrupt-pending flag to logic 1. If interrupts are enabled for the flag, an interrupt
request will be generated and the CPU will vector to the ISR address associated with the interrupt-pending
flag. MCU interrupt sources, associated vector addresses, priority order, and control bits are summarized
in Table 10.1 on page 99. Refer to the data sheet section associated with a particular on-chip peripheral for
information regarding valid interrupt conditions for the peripheral and the behavior of its interrupt-pending
flag(s).
10.2. Interrupt Priorities
Each interrupt source can be individually programmed to one of two priority levels: low or high. A low prior-
ity interrupt service routine can be preempted by a high priority interrupt. A high priority interrupt cannot be
preempted. Each interrupt has an associated interrupt priority bit in an SFR (IP or EIP1) used to configure
its priority level. Low priority is the default. If two interrupts are recognized simultaneously, the interrupt with
the higher priority is serviced first. If both interrupts have the same priority level, a fixed priority order is
used to arbitrate, given in Table 10.1.
10.3. Interrupt Latency
Interrupt response time depends on the state of the CPU when the interrupt occurs. Pending interrupts are
sampled and priority decoded each system clock cycle. Therefore, the fastest possible response time is 5
system clock cycles: 1 clock cycle to detect the interrupt and 4 clock cycles to complete the LCALL to the
ISR. If an interrupt is pending when a RETI is executed, a single instruction is executed before an LCALL
is made to service the pending interrupt. Therefore, the maximum response time for an interrupt (when no
other interrupt is currently being serviced or the new interrupt is of greater priority) occurs when the CPU is
performing an RETI instruction followed by a DIV as the next instruction. In this case, the response time is
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| C8051F531A-ITR | 功能描述:8位微控制器 -MCU 25 MIPS 8 kB 256 SPI 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(fēng)格:SMD/SMT |
| C8051F531-C-IM | 制造商:Silicon Laboratories Inc 功能描述:25 MIPS, 8 KB, 256, SPI, UART, QFN20 - Rail/Tube 制造商:Silicon Laboratories Inc 功能描述:IC MCU 8051 8KB FLASH 20QFN |
| C8051F531-C-IMR | 制造商:Silicon Laboratories Inc 功能描述:25 MIPS, 8 KB, 256, SPI, UART, QFN20 - Tape and Reel 制造商:Silicon Laboratories Inc 功能描述:IC MCU 8051 8KB FLASH 20QFN |
| C8051F531-C-IT | 制造商:Silicon Laboratories Inc 功能描述:MCU 8-bit C8051F53x 8051 CISC 8KB Flash 2.5V/3.3V/5V 20-Pin TSSOP 制造商:Silicon Laboratories Inc 功能描述:25 MIPS, 8 KB, 256, SPI, UART, TSSOP20 - Rail/Tube 制造商:Silicon Laboratories Inc 功能描述:IC MCU 8051 8KB FLASH 20TSSOP 制造商:Silicon Laboratories Inc 功能描述:8-bit Microcontrollers - MCU 25 MIPS 8 kB 256 SPI UART TSSOP20 |
| C8051F531-C-ITR | 制造商:Silicon Laboratories Inc 功能描述:25 MIPS, 8 KB, 256, SPI, UART, 制造商:Silicon Laboratories Inc 功能描述:25 MIPS, 8 KB, 256, SPI, UART, TSSOP20 - Tape and Reel 制造商:Silicon Laboratories Inc 功能描述:IC MCU 8051 8KB FLASH 20TSSOP 制造商:Silicon Laboratories Inc 功能描述:8-bit Microcontrollers - MCU 25 MIPS 8 kB 256 SPI UART TSSOP20 |
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