MCF51EM256CLL Freescale Semiconductor, MCF51EM256CLL Datasheet - Page 27

• 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

1.3.2
Figure 1-3
functional units. Some modules in the microcontroller have selectable clock inputs. All memory-mapped
registers associated with the modules (except RGPIO) are clocked with BUSCLK. The RGPIO registers
are clocked with the CPU clock (ICSOUT).
A unique feature of this product family is the independent real time clock (IRTC) and secondary 32 kHz
crystal oscillator operating on an independent power domain. The IRTC can be powered by an independent
coin battery, and will continue to count even when the main CPU supply is down. The “Clock Check &
Select” function allows the CPU to check that oscillator outputs are active prior to switching to one of the
two as the reference for the ICS.
Freescale Semiconductor
shows how clocks from the ICS and XOSC are distributed to the microcontroller’s other
Clock Distribution Diagram
RANGE
HGO
1
MCF51EM256 Series ColdFire Integrated Microcontroller Reference Manual, Rev. 8
Clock signal to the IRTC is only from XOSC1.
IREFS
External Reference
Clock Source
n=0–7
RDIV
/ 2
Optional
Block
n
Figure 1-2. Simplified ICS Block Diagram
IREFSTEN
Reference
Internal
RDIV_CLK
TRIM
Clock
9
EREFSTEN
EREFS
Filter
DCO
LP
FLL
ERCLKEN
IRCLKEN
9
Internal Clock Source Block
CLKS
DCOOUT
n=0–3
BDIV
/ 2
/ 2
n
IRTC
ICSERCLK
ICSIRCLK
ICSOUT
ICSLCLK
ICSFFCLK
1
Device Overview
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