MCF51EM256CLL Freescale Semiconductor, MCF51EM256CLL Datasheet - Page 604

• 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

Version 1 ColdFire Debug (CF1_DEBUG)
26.4.1.5.4
Provided XCSR[ENBDM] is set (BDM enabled), the BACKGROUND command causes the target MCU
to enter active background (halt) mode as soon as the current CPU instruction finishes. If ENBDM is
cleared (its default value), the BACKGROUND command is ignored.
A delay of 32 BDC clock cycles is required after the BACKGROUND command to allow the target MCU
to finish its current CPU instruction and enter active background mode before a new BDC command can
be accepted.
After the target MCU is reset into a normal operating mode, the host debugger would send a
WRITE_XCSR_BYTE command to set ENBDM before attempting to send the BACKGROUND
command the first time. Normally, the development host would set ENBDM once at the beginning of a
debug session or after a target system reset, and then leave the ENBDM bit set during debugging
operations. During debugging, the host would use GO commands to move from active background mode
to normal user program execution and would use BACKGROUND commands or breakpoints to return to
active background mode.
26.4.1.5.5
26-40
Enter active background mode (if enabled)
Read memory specified by debug address register, then
increment address
BACKGROUND
DUMP_MEM.sz, DUMP_MEM.sz_WS
MCF51EM256 Series ColdFire Integrated Microcontroller Reference Manual, Rev. 8
host →
host →
host →
host →
target
target
target
target
0x04
0x32
0x36
0x3A
D
D
D
D
L
Y
L
Y
L
Y
L
Y
data[31-24]
data[15-8]
data[7-0]
target →
target →
target →
Memory
Memory
Memory
host
host
host
data[23-16]
data[7-0]
target →
target →
Memory
Memory
DUMP_MEM.sz
host
host
data[15-8]
target →
Memory
host
data[7-0]
target →
Memory
host
Non-intrusive
Non-intrusive
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