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參數(shù)資料
| 型號： | DS80C390-QNR |
| 元件分類： | 微處理器 |
| 英文描述： | Dual CAN High-Speed Microprocessor |
| 中文描述： | 雙CAN高速微處理器 |
| 文件頁數(shù)： | 19/58頁 |
| 文件大?。?/td> | 5486K |
| 代理商： | DS80C390-QNR |
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DS80C390
19 of 58
110199
POWER MANAGEMENT MODE (PMM)
Machine Cycle Rate
Full Operation
(4 clocks per
machine cycle)
2.765 MHz
4.0 MHz
6.25 MHz
8.25 MHz
10.0 MHz
Operating Current Estimates
Full Operation
(4 clocks per
machine cycle)
13.1 ma
17.2 ma
25.7 ma
32.8 ma
TBD
Crystal Speed
PMM
(1024 clocks per
machine cycle)
10.8 kHz
15.6 kHz
24.4 kHz
32.2 kHz
39.1 kHz
PMM
(1024 clocks per
machine cycle)
4.8 ma
5.6 ma
7.0 ma
8.2 ma
TBD
11.0592 MHz
16 MHz
25 MHz
33 MHz
40 MHz
Note that power consumption in PMM is less than Idle mode. While both modes leave the power-hungry
internal timers running, PMM runs all clocked functions such as timers at the rate of crystal divided by
1024, rather than crystal divided by 4. Even though instruction execution continues in PMM (albeit at a
reduced speed), it still consumes less power than Idle mode. As a result there is little reason to use Idle
mode in new designs.
SWITCHBACK
When enabled, the Switchback feature allows serial ports and interrupts to automatically switch back
from divide by 1024 (PMM) to divide by 4 (standard speed) operation. This feature makes it very
convenient to use the Power Management Mode in real-time applications. Software can simply set the
CD1 and CD0 clock control bits to the 4 clocks per cycle mode to exit PMM. However, the
microcontroller provides hardware alternatives for automatic Switchback to standard speed (divide by 4)
operation.
The Switchback feature is enabled by setting the SFR bit SWB (PMR.5) to a 1. Once it is enabled, and
when PMM is selected, two possible events can cause an automatic Switchback to divide by four mode.
First, if an interrupt occurs and is acknowledged, the system clock will revert from PMM to divide by
four mode. For example, if
INT0
is enabled and the CPU is not servicing a higher priority interrupt, then
Switchback will occur on
INT0
. However, if
INT0
is not enabled or the CPU is servicing a higher
priority interrupt, then activity on
INT0
will not cause Switchback to occur.
A Switchback can also occur when an enabled UART detects the start bit indicating the beginning of an
incoming serial character or when the SBUF register is loaded initiating a serial transmission. Note that a
serial character’s start bit does not generate an interrupt. The interrupt occurs only on reception of a
complete serial word. The automatic Switchback on detection of a start bit allows timer hardware to
return to divide by 4 operation (and the correct baud rate) in time for a proper serial reception or
transmission. So with Switchback enabled and a serial port enabled, the automatic switch to divide by 4
operation occurs in time to receive or transmit a complete serial character as if nothing special had
happened.
STATUS
The Status register (STATUS;C5h) provides information about interrupt and serial port activity to assist
in determining if it is possible to enter PMM. The microprocessor supports three levels of interrupt
priority: Power-fail, High, and Low. The PIP (Power-fail Priority Interrupt Status; STATUS.7), HIP
(High Priority Interrupt Status; STATUS.6), and LIP (Low Priority Interrupt Status; STATUS.5) status
bits, when set to a logic one, indicate the corresponding level is in service.
相關PDF資料 |
PDF描述 |
|---|---|
| DS80C390-FCR | Dual CAN High-Speed Microprocessor |
| DS80C390-FNR | Dual CAN High-Speed Microprocessor |
| DS80C390-QCR | Dual CAN High-Speed Microprocessor |
| DS80C410 | Network Microcontrollers with Ethernet and CAN |
| DS80C410-FNY | Network Microcontrollers with Ethernet and CAN |
相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS80C390-QNR+ | 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 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 安裝風格:SMD/SMT |
| DS80C400 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Network Microcontroller |
| DS80C400_03 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Network Microcontroller |
| DS80C400_07 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Network Microcontroller |
| DS80C400_09 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Network Microcontroller |
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