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参数资料
| 型号： | DS80C390-FCR |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | Microcontroller |
| 英文描述： | 8-BIT, MROM, 100 MHz, MICROCONTROLLER, PQFP64 |
| 封装： | LQFP-64 |
| 文件页数： | 39/54页 |
| 文件大小： | 2030K |
| 代理商： | DS80C390-FCR |
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DS80C390 Dual CAN High-Speed Microprocessor
44 of 54
POWER-FAIL RESET
The microcontroller incorporates an internal precision bandgap voltage reference and comparator circuit that
provide a power-on and power-fail reset function. This circuit monitors the processor’s incoming power supply
voltage (VCC), and holds the processor in reset while VCC is below the minimum voltage level. When power exceeds
the reset threshold, a full power-on reset is performed. In this way, this internal voltage monitoring circuitry handles
both power-up and power-down conditions without the need for additional external components.
Once VCC has risen above VRST, the device automatically restarts the oscillator for the external crystal and counts
65,536 clock cycles before program execution begins at location 0000h. This helps the system maintain reliable
operation by only permitting processor operation when the supply voltage is in a known good state. Software can
determine that a power-on reset has occurred by checking the power-on reset flag (POR;WDCON.6). Software
should clear the POR bit after reading it.
POWER-FAIL INTERRUPT
The bandgap voltage reference that sets a precise reset threshold also generates an optional early warning power-
fail interrupt (PFI). When enabled by software, the processor vectors to ROM address 0033h if VCC drops below
VPFW. PFI has the highest priority. The PFI enable is in the watchdog control SFR (EPFI;WDCON.5). Setting this bit
to logic 1 enables the PFI. Application software can also read the PFI flag at WDCON.4. A PFI condition sets this
bit to 1. The flag is independent of the interrupt enable and must be cleared by software.
EXTERNAL RESET PINS
The DS80C390 has reset input (RST) and reset output (
RSTOL) pins. The RSTOL pin supplies an active-low reset
when the microprocessor is issued a reset from either a high on the RST pin, a timeout of the watchdog timer, a
crystal oscillator fail, or an internally detected power fail. The timing of the
RSTOL pin is dependent on the source of
the reset.
RESET TYPE/SOURCE
RSTOL DURATION
Power-On Reset
65,536 tCLCL (as described in Power Cycle Timing Characteristics)
External Reset
<1.25 machine cycles
Power Fail
65,536 tCLCL (as described in Power Cycle Timing Characteristics)
Watchdog Timer Reset
2 machine cycles
Oscillator-Fail Detect
65,536 tCLCL (as described in Power Cycle Timing Characteristics)
INTERRUPTS
The microcontroller provides 16 interrupt sources with three priority levels. All interrupts, with the exception of the
power-fail interrupt, are controlled by a series combination of individual enable bits and a global interrupt-enable,
EA (IE.7). Setting EA to 1 allows individual interrupts to be enabled. Clearing EA disables all interrupts regardless
of their individual enable settings.
The three available priority levels are low, high, and highest. The highest priority level is reserved for the power-fail
interrupt only. All other interrupt priority levels have individual priority bits that, when set to 1, establish the
particular interrupt as high priority. In addition to the user-selectable priorities, each interrupt also has an inherent
natural priority, used to determine the priority of simultaneously occurring interrupts. The available interrupt
sources, their flags, their enables, their natural priority, and their available priority selection bits are identified in
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS80C390-FCR+ | 功能描述:8位微控制器 -MCU Dual CAN High-Speed RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| DS80C390-FNR | 功能描述:8位微控制器 -MCU Dual CAN High-Speed RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| DS80C390-FNR+ | 功能描述:8位微控制器 -MCU Dual CAN High-Speed RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| DS80C390-QCR | 功能描述:8位微控制器 -MCU Dual CAN High-Speed RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| DS80C390-QCR+ | 功能描述:8位微控制器 -MCU Dual CAN High-Speed RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
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