參數(shù)資料
型號(hào)： DS80CH11
英文描述： System Energy Manager
中文描述： 系統(tǒng)能量管理器
文件頁(yè)數(shù)： 67/88頁(yè)
文件大?。?/td> 598K
代理商： DS80CH11
DS80CH11
011200 67/88
SLOW CLOCK MODE INSTRUCTION CYCLE RATE
Table 12–1
CRYSTAL SPEED
FULL SPEED
(4 CLOCKS)
SLOW CLOCK
(64 CLOCKS)
SLOW CLOCK
(1024 CLOCKS)
1.8432 MHz
460.8 KHz
28.8 KHz
1.8 KHz
11.0592 MHz
2.765 MHz
172.8 KHz
10.8 KHz
22 MHz
5.53 MHz
345.6 KHz
21.6 KHz
25 MHz
6.25 MHz
390.6 KHz
24.4 KHz
SLOW CLOCK MODE OPERATING CURRENT ESTIMATES
Table 12–2
CRYSTAL SPEED
FULL SPEED
(4 CLOCKS)
SLOW CLOCK
(64 CLOCKS)
SLOW CLOCK
(1024 CLOCKS)
1.8432 MHz
3.1 mA
1.2 mA
1.0 mA
3.57 MHz
5.3 mA
1.6 mA
1.1 mA
11.0592 MHz
15.5 mA
4.8 mA
4.0 mA
16 MHz
21 mA
7.1 mA
6.0 mA
22 MHz
25.5 mA
8.3 mA
6.5 mA
25 MHz
31 mA
9.7 mA
8.0 mA
12.2.1.1 Crystaless Slow Clock Mode
A major component of power consumption in Slow
Clock Mode is the crystal amplifier circuit. The SEM
allows the user the option to switch CPU operation to an
internal ring oscillator and turn off the crystal amplifier.
The CPU would then have a clock source of approxi-
mately 4 MHz, divided by either 4, 64, or 1024. The ring
oscillator as a time base is not precise and as a result
software can not perform precision timing. However,
this mode allows an additional saving of between 0.5
and 6.0 mA depending on the actual crystal frequency.
While this saving is of little use when running at 4 clocks
per instruction cycle, it makes a major contribution when
running in Slow Clock Mode.
12.2.1.2 Slow Clock Mode Operation
Software invokes the Slow Clock Mode by setting the
appropriate bits in the SFR area. The basic choices are
divider speed and clock source. There are three speeds
(4, 64, 1024) and two clock sources (crystal, ring). Both
the decisions and the controls are separate. Software
will typically select the clock speed first. Then, it will per-
form the switch to ring operation if desired. Lastly, soft-
ware can disable the crystal amplifier if desired.
There are two ways of exiting Slow Clock Mode. Soft-
ware can remove the condition by reversing the proce-
dure that invoked Slow Clock Mode or hardware can
(optionally) remove it. To resume operation at a divide
by 4 rate under software control, simply select 4 clocks
per cycle, then crystal based operation if relevant.
When disabling the crystal as the time base in favor of
the ring oscillator, there are timing restrictions
associated with restarting the crystal operation. Details
are described below.
There are three registers containing bits that are con-
cerned with Slow Clock Mode functions. They are
Power Management Register (PMR; C4h), Status
(STATUS; C5h), and External Interrupt Flag (EXIF; 91h)
12.2.1.3 Clock Divider
Software can select the instruction cycle rate by select-
ing bits CD1 (PMR.7) and CD0 (PMR.6) as follows:
CD1
0
0
1
1
CD0
0
1
0
1
Cycle rate
Reserved
4 clocks (default)
64 clocks
1024 clocks
The selection of instruction cycle rate will take effect
after a delay of one instruction cycle. Note that the clock
divider choice applies to all functions including timers.
Since baud rates are altered, it will be difficult to conduct
serial communication while in Slow Clock Mode. There
相關(guān)PDF資料
PDF描述
DS83C520 EPROM/ROM High-Speed Micro
DS83C520-ECL EPROM/ROM High-Speed Micro
DS83C520-ENL EPROM/ROM High-Speed Micro
DS83C520-MCL EPROM/ROM High-Speed Micro
DS83C520-MNL EPROM/ROM High-Speed Micro
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS80CH11+E02 制造商:Maxim from Components Direct 功能描述:MAXIM DS80CH11+E02 SYSTEM ENERGY MANAGERS - Trays 制造商:Maxim 功能描述:Maxim DS80CH11+E02 System Energy Managers
DS80CH11-E02 制造商:Maxim from Components Direct 功能描述:MAXIM DS80CH11-E02 SYSTEM ENERGY MANAGERS - Trays 制造商:Maxim 功能描述:Maxim DS80CH11-E02 System Energy Managers
DS80E100 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:5 to 12.5 Gbps, Power-Saver Equalizer for Backplanes and Cables
DS80EP100 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:5 to 12.5 Gbps, Power-Saver Equalizer for Backplanes and Cables
DS80EP100_08 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:5 to 12.5 Gbps, Power-Saver Equalizer for Backplanes and Cables
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*