MCF51JF128VHS 查看數據表（PDF） - Freescale Semiconductor

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MCF51JF128VHS

Embedded - Microcontrollers

Freescale Semiconductor 

Nonswitching electrical specifications

2. VDD = 3 V, TA = 25 °C, fOSC = 32 kHz (crystal), fBUS = 24 MHz

3. Specified according to Annex D of IEC Standard 61967-2, Measurement of Radiated Emissions—TEM Cell and Wideband

TEM Cell Method.

5.2.7 Designing with radiated emissions in mind

To find application notes that provide guidance on designing your system to minimize

interference from radiated emissions:

1. Go to http://www.freescale.com.

2. Perform a keyword search for “EMC design.”

5.2.8 Capacitance attributes

Table 7. Capacitance attributes

Symbol

CIN_A

CIN_D

Description

Input capacitance: analog pins

Input capacitance: digital pins

Min.

Max.

Unit

—

7

pF

—

7

pF

5.3 Switching electrical specifications

Table 8. Device clock specifications

Symbol

fSYS

fSYS_USB

fBUS

FB_CLK

fLPTMR

fSYS

fBUS

FB_CLK

fLPTMR

Description

Normal run mode

System and core clock

System and core clock when USB in operation

Bus clock

Mini-FlexBus clock

LPTMR clock

VLPR mode

System and core clock

Bus clock

Mini-FlexBus clock

LPTMR clock2

Min.

—

20

—

—

—

—

—

—

—

Max.

50

—

25

25

25

2

1

1

25

Unit

MHz

MHz

MHz

MHz

MHz

MHz

MHz

MHz

MHz

Notes

1

1

1. When the Mini-FlexBus is enabled, its clock frequency is always the same as the bus clock frequency.

2. A maximum frequency of 25 MHz for the LPTMR in VLPR mode is possible when the LPTMR is configured for pulse

counting mode and is driven externally via the LPTMR_ALT1, LPTMR_ALT2, or LPTMR_ALT3 pin.

MCF51JF128 Data Sheet, Rev. 6, 01/2012.

18

Freescale Semiconductor, Inc.

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