MCF51EM256CLL Freescale Semiconductor, MCF51EM256CLL Datasheet - Page 260

• 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

Internal Clock Source (ICS)
11.1.9
There are seven modes of operation for the ICS: FEI, FEE, FBI, FBILP, FBE, FBELP, and stop.
11.1.9.1
In FLL engaged internal mode, which is the default mode, the ICS supplies a clock derived from the FLL
which is controlled by the internal reference clock. The BDC clock is supplied from the FLL.
11.1.9.2
In FLL engaged external mode, the ICS supplies a clock derived from the FLL which is controlled by an
external reference clock source. The BDC clock is supplied from the FLL.
11.1.9.3
In FLL bypassed internal mode, the FLL is enabled and controlled by the internal reference clock, but is
bypassed. The ICS supplies a clock derived from the internal reference clock. The BDC clock is supplied
from the FLL.
11-6
Modes of Operation
FLL Engaged Interna
FLL Engaged External
FLL Bypassed Interna
FTRIM
MCF51EM256 Series ColdFire Integrated Microcontroller Reference Manual, Rev. 1.11
DRST IREFST CLKST OSCINIT
RANGE
IREFSTEN
Reference
HGO
Internal
Clock
TRIM
External Reference
Figure 11-6. Internal Clock Source (ICS) Block Diagram
n=0-10
RDIV
/ 2
Clock
n
IREFS
EREFSTEN
l (FEI)
EREFS
l (FBI)
(FEE)
DMX32
Filter
LP
DCOM
DCOH
DCOL
FLL
ERCLKEN
IRCLKEN
Internal Clock Source Block
DRS
DCOOUT
STOP
CLKS
n=0-3
BDIV
/ 2
/ 2
n
Freescale Semiconductor
ICSLCLK
ICSDCLK
OSCOUT
ICSERCLK
ICSIRCLK
ICSOUT
ICSFFCLK