MCF51EM256CLL Freescale Semiconductor, MCF51EM256CLL Datasheet - Page 267

• Manufacturer Part Number: MCF51EM256CLL
• Description: IC MCU 32BIT 256KB FLASH 100LQFP
• Manufacturer: Freescale Semiconductor
• Series: MCF51EMr

Specifications of MCF51EM256CLL

• Core Processor: Coldfire V1
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: I²C, SCI, SPI
• Peripherals: LCD, LVD, PWM, WDT
• Number Of I /o: 63
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Data Converters: A/D 16x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-LQFP
• Processor Series: MCF51EM
• Core: ColdFire V1
• Data Bus Width: 32 bit
• Data Ram Size: 16 KB
• Interface Type: RS-232, LIN
• Maximum Clock Frequency: 50 MHz
• Number Of Timers: 3
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: JLINK-CF-BDM26, EWCF
• Development Tools By Supplier: DEMOEM
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

11.4
11.4.1
The seven states of the ICS are shown as a state diagram and are described below. The arrows indicate the
allowed movements between the states.
11.4.1.1
FLL engaged internal (FEI) is the default mode of operation and is entered when all the following
conditions occur:
In FLL engaged internal mode, the ICSOUT clock is derived from the FLL clock, which is controlled by
the internal reference clock. The FLL loop locks the frequency to the FLL factor times the internal
reference frequency. The ICSLCLK is available for BDC communications, and the internal reference
clock is enabled.
Freescale Semiconductor
FLL Bypassed
External Low
Power(FBELP)
•
•
IREFS=0
CLKS=10
BDM Disabled
and LP=1
CLKS bits are written to 00.
IREFS bit is written to 1.
Functional Description
Operational Modes
FLL Engaged Internal (FEI)
Entered from any state
when MCU enters stop
MCF51EM256 Series ColdFire Integrated Microcontroller Reference Manual, Rev. 8
IREFS=0
CLKS=10
BDM Enabled
or LP =0
FLL Bypassed
External (FBE)
Figure 11-11. Clock Switching Modes
FLL Engaged
External (FEE)
FLL Engaged
Internal (FEI)
IREFS=1
CLKS=00
IREFS=0
CLKS=00
Stop
FLL Bypassed
Internal (FBI)
Returns to state that was active
before MCU entered stop, unless
RESET occurs while in stop.
IREFS=1
CLKS=01
BDM Enabled
or LP=0
Internal Clock Source (ICS)
FLL Bypassed
Internal Low
Power(FBILP)
IREFS=1
CLKS=01
BDM Disabled
and LP=1
11-13