MCF51EM256CLL Freescale Semiconductor, MCF51EM256CLL Datasheet - Page 106

IC MCU 32BIT 256KB FLASH 100LQFP

MCF51EM256CLL

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

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

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MCF51EM256CLL
Manufacturer:
FREESCALE
Quantity:
110
Part Number:
MCF51EM256CLL
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Memory
The backdoor key access sequence is monitored by an internal security state machine. An illegal operation
during the backdoor key access sequence causes the security state machine to lock, leaving the MCU in
the secured state. A reset of the MCU causes the security state machine to exit the lock state and allows a
new backdoor key access sequence to be attempted. The following operations during the backdoor key
access sequence lock the security state machine:
After the backdoor keys have been correctly matched, the MCU is unsecured. After the MCU is unsecured,
the flash security byte can be programmed to the unsecure state, if desired.
In the unsecure state, you have full control of the contents of the backdoor keys by programming the
associated addresses in the flash configuration field (see
Locations”).
The security as defined in the flash security byte is not changed by using the backdoor key access sequence
to unsecure. The stored backdoor keys are unaffected by the backdoor key access sequence. After the next
reset of the MCU, the security state of the flash module is determined by the flash security byte. The
backdoor key access sequence has no effect on the program and erase protections defined in the flash
protection register (FxPROT).
It is not possible to unsecure the MCU by using the backdoor key access sequence in background debug
mode (BDM) because the MCU does not allow flash array writes in BDM to the flash module.
3-50
5. If all data written match the backdoor keys, the MCU is unsecured and the SEC[1:0] bits in the
1. If any of the keys written does not match the backdoor keys programmed in the flash array.
2. If the keys are written in the wrong sequence.
3. If any of the keys written are all 0’s or all 1’s.
4. If the KEYACC bit does not remain set while the keys are written.
5. If any of the keys are written on successive MCU clock cycles.
6. Executing a STOP instruction before all keys have been written.
NVOPT register are forced to an unsecured state.
MCF51EM256 Series ColdFire Integrated Microcontroller Reference Manual, Rev. 8
Section 3.6, “Flash Module Reserved Memory
Freescale Semiconductor

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