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| 型號： | KSZ8895MQI |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 85/119頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ETHERNET SWITCH 5PORT 128PQFP |
| 特色產(chǎn)品： | KSZ8895MQ Ethernet Switches |
| 標準包裝： | 66 |
| 系列： | * |
| 其它名稱： | 576-3997 |
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PIC16(L)F1782/3
DS41579C-page 68
Preliminary
2011-2012 Microchip Technology Inc.
6.4
Two-Speed Clock Start-up Mode
Two-Speed Start-up mode provides additional power
savings by minimizing the latency between external
oscillator start-up and code execution. In applications
that make heavy use of the Sleep mode, Two-Speed
Start-up will remove the external oscillator start-up
time from the time spent awake and can reduce the
overall power consumption of the device. This mode
allows the application to wake-up from Sleep, perform
a few instructions using the INTOSC internal oscillator
block as the clock source and go back to Sleep without
waiting for the external oscillator to become stable.
Two-Speed Start-up provides benefits when the oscil-
lator module is configured for LP, XT or HS modes.
The Oscillator Start-up Timer (OST) is enabled for
these modes and must count 1024 oscillations before
the oscillator can be used as the system clock source.
If the oscillator module is configured for any mode
other than LP, XT or HS mode, then Two-Speed
Start-up is disabled. This is because the external clock
oscillator does not require any stabilization time after
POR or an exit from Sleep.
If the OST count reaches 1024 before the device
enters Sleep mode, the OSTS bit of the OSCSTAT reg-
ister is set and program execution switches to the
external oscillator. However, the system may never
operate from the external oscillator if the time spent
awake is very short.
6.4.1
TWO-SPEED START-UP MODE
CONFIGURATION
Two-Speed Start-up mode is configured by the
following settings:
IESO (of the Configuration Words) = 1; Inter-
nal/External Switchover bit (Two-Speed Start-up
mode enabled).
SCS (of the OSCCON register) = 00.
FOSC<2:0> bits in the Configuration Words
configured for LP, XT or HS mode.
Two-Speed Start-up mode is entered after:
Power-on Reset (POR) and, if enabled, after
Power-up Timer (PWRT) has expired, or
Wake-up from Sleep.
TABLE 6-1:
OSCILLATOR SWITCHING DELAYS
Note:
Executing a SLEEP instruction will abort
the oscillator start-up time and will cause
the OSTS bit of the OSCSTAT register to
remain clear.
Switch From
Switch To
Frequency
Oscillator Delay
Sleep/POR
LFINTOSC(1)
MFINTOSC(1)
HFINTOSC(1)
31 kHz
31.25 kHz-500 kHz
31.25kHz-16MHz
Oscillator Warm-up Delay (TWARM)
Sleep/POR
EC, RC(1)
DC – 32 MHz
2 cycles
LFINTOSC
EC, RC(1)
DC – 32 MHz
1 cycle of each
Sleep/POR
Timer1 Oscillator
LP, XT, HS(1)
32 kHz-20 MHz
1024 Clock Cycles (OST)
Any clock source
MFINTOSC(1)
HFINTOSC(1)
31.25 kHz-500 kHz
31.25kHz-16MHz
2
s (approx.)
Any clock source
LFINTOSC(1)
31 kHz
1 cycle of each
Any clock source
Timer1 Oscillator
32 kHz
1024 Clock Cycles (OST)
PLL inactive
PLL active
16-32 MHz
2 ms (approx.)
Note 1:
PLL inactive.
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| KSZ8895MQXCA | 功能描述:Ethernet Switch 10/100 Base-T/TX I2C, SPI Interface 128-PQFP (14x20) 制造商:microchip technology 系列:- 包裝:托盤 零件狀態(tài):有效 協(xié)議:以太網(wǎng) 功能:開關(guān) 接口:I2C，SPI 標準:10/100 Base-T/TX 電壓 - 電源:1.8V，2.5V，3.3V 電流 - 電源:129mA 工作溫度:0°C ~ 70°C 封裝/外殼:128-BFQFP 供應(yīng)商器件封裝:128-PQFP（14x20） 標準包裝:66 |
| KSZ8895MQXIA | 功能描述:Ethernet Switch 10/100 Base-T/TX I2C, SPI Interface 128-PQFP (14x20) 制造商:microchip technology 系列:- 包裝:托盤 零件狀態(tài):有效 協(xié)議:以太網(wǎng) 功能:開關(guān) 接口:I2C，SPI 標準:10/100 Base-T/TX 電壓 - 電源:1.8V，2.5V，3.3V 電流 - 電源:129mA 工作溫度:-40°C ~ 85°C 封裝/外殼:128-BFQFP 供應(yīng)商器件封裝:128-PQFP（14x20） 標準包裝:66 |
| KSZ8895RQ | 功能描述:以太網(wǎng) IC 5-port Switch, one SW5-RMII and one P5-RMII Interface RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| KSZ8895RQ TR | 功能描述:以太網(wǎng) IC 5-port Switch, one SW5-RMII and one P5-RMII Interface RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| KSZ8895RQ-EVAL | 功能描述:以太網(wǎng)開發(fā)工具 5-port Switch, one SW5-RMII and one P5-RMII Interface - Evaluation Board RoHS:否 制造商:Micrel 產(chǎn)品:Evaluation Boards 類型:Ethernet Transceivers 工具用于評估:KSZ8873RLL 接口類型:RMII 工作電源電壓: |
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