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参数资料
| 型号： | KSZ8851-16MQL |
| 厂商： | Micrel Inc |
| 文件页数： | 31/88页 |
| 文件大小： | 0K |
| 描述： | IC CTLR MAC/PHY NON-PCI 128-PQFP |
| 产品培训模块： | KSZ8851 10/100 Embedded Controllers |
| 标准包装： | 66 |
| 控制器类型： | 以太网控制器，MAC/PHY |
| 接口： | 总线 |
| 电源电压： | 1.8V，2.5V，3.3V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 128-BFQFP |
| 供应商设备封装： | 128-PQFP（14x20） |
| 包装： | 托盘 |
| 产品目录页面： | 1081 (CN2011-ZH PDF) |
| 配用： | 576-3292-ND - BOARD EVALUATION KSZ8851-16MLL |
| 其它名称： | 576-3253 |
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PIC18F45J10 FAMILY
DS39682E-page 36
2009 Microchip Technology Inc.
4.1.3
CLOCK TRANSITIONS AND STATUS
INDICATORS
The length of the transition between clock sources is
the sum of two cycles of the old clock source and three
to four cycles of the new clock source. This formula
assumes that the new clock source is stable.
Two bits indicate the current clock source and its
status:
OSTS
(OSCCON<3>)
and
T1RUN
(T1CON<6>). In general, only one of these bits will be
set while in a given power-managed mode. When the
OSTS bit is set, the primary clock is providing the
device clock. When the T1RUN bit is set, the Timer1
oscillator is providing the clock. If neither of these bits
is set, INTRC is clocking the device.
4.1.4
MULTIPLE SLEEP COMMANDS
The power-managed mode that is invoked with the
SLEEP
instruction is determined by the setting of the
IDLEN bit at the time the instruction is executed. If
another SLEEP instruction is executed, the device will
enter the power-managed mode specified by IDLEN at
that time. If IDLEN has changed, the device will enter the
new power-managed mode specified by the new setting.
4.2
Run Modes
In the Run modes, clocks to both the core and
peripherals are active. The difference between these
modes is the clock source.
4.2.1
PRI_RUN MODE
The PRI_RUN mode is the normal, full-power execu-
tion mode of the microcontroller. This is also the default
mode upon a device Reset unless Two-Speed Start-up
is enabled (see Section 21.4 “Two-Speed Start-up”
for details). In this mode, the OSTS bit is set. (see
4.2.2
SEC_RUN MODE
The SEC_RUN mode is the compatible mode to the
“clock switching” feature offered in other PIC18
devices. In this mode, the CPU and peripherals are
clocked from the Timer1 oscillator. This gives users the
option of lower power consumption while still using a
high-accuracy clock source.
SEC_RUN mode is entered by setting the SCS<1:0>
bits to ‘01’. The device clock source is switched to the
Timer1 oscillator (see Figure 4-1), the primary
oscillator is shut down, the T1RUN bit (T1CON<6>) is
set and the OSTS bit is cleared.
On transitions from SEC_RUN mode to PRI_RUN
mode, the peripherals and CPU continue to be clocked
from the Timer1 oscillator while the primary clock is
started. When the primary clock becomes ready, a
clock switch back to the primary clock occurs (see
Figure 4-2). When the clock switch is complete, the
T1RUN bit is cleared, the OSTS bit is set and the
primary clock is providing the clock. The IDLEN and
SCS bits are not affected by the wake-up; the Timer1
oscillator continues to run.
FIGURE 4-1:
TRANSITION TIMING FOR ENTRY TO SEC_RUN MODE
Note:
Executing a SLEEP instruction does not
necessarily place the device into Sleep
mode. It acts as the trigger to place the
controller into either Sleep mode or one of
the Idle modes, depending on the setting
of the IDLEN bit.
Note:
The Timer1 oscillator should already be
running prior to entering SEC_RUN mode.
If the T1OSCEN bit is not set when the
SCS<1:0> bits are set to ‘01’, entry to
SEC_RUN mode will not occur. If the
Timer1 oscillator is enabled, but not yet
running, device clocks will be delayed until
the oscillator has started. In such situa-
tions, initial oscillator operation is far from
stable and unpredictable operation may
result.
Q4
Q3
Q2
OSC1
Peripheral
Program
Q1
T1OSI
Q1
Counter
Clock
CPU
Clock
PC + 2
PC
12
3
n-1
n
Clock Transition
Q4
Q3
Q2
Q1
Q3
Q2
PC + 4
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相关代理商/技术参数 |
参数描述 |
|---|---|
| KSZ8851-16MQL-EVAL | 功能描述:以太网开发工具 Single Ethernet Port + Generic (16-bit) Bus Interface(Lead Free) Eval Board RoHS:否 制造商:Micrel 产品:Evaluation Boards 类型:Ethernet Transceivers 工具用于评估:KSZ8873RLL 接口类型:RMII 工作电源电压: |
| KSZ8851-16MQLI | 功能描述:以太网 IC Single Ethernet Port + Generic (16-bit) Bus Interface(Lead Free, I-Temp) RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray |
| KSZ8851-32MQL | 功能描述:以太网 IC 10/100BT Ethernet MAC + PHY with Generic (32-bit) Bus Interface, Lead Free RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray |
| KSZ8851-32MQLI | 功能描述:以太网 IC 10/100BT Ethernet MAC + PHY with Generic (32-bit) Bus Interface (I-Temp) RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray |
| KSZ8851MLL | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Single Port MAC/PHY Controller with Non PCI Interface |
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