MCF51EM256CLL Freescale Semiconductor, MCF51EM256CLL Datasheet - Page 518

• 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

LCD Driver Module
24.1.2
In LCD module, only LCDC0, LCDC1, LCDSUPPLY, LCDRVC, LCDBCTL, and LCDS registers can be
read, while the rest of the LCD registers are write only. Because of this, application software is responsible
for keeping track the current values by shadowing values in RAM variables. While powered from the line
voltage, the application may choose to update all segments rather than track current values since power
consumption is not an issue. However, during blackout conditions, if the meter is required to maintain and
update the display, the need for power efficient updates is greater.
Shadowing the registers in RAM will add some s/w overhead, however it should add little overhead to
execution time.
24-2
User Considerations
LCD registers require several cycles between write accesses. Only byte
writes should be used to write to these registers. Finally, consecutive writes
must be separated by at least one non-write cycle.
Refer to
connected to.
MCF51EM256 series do not have the VLCD pin, any reference to it must
be ignored.
MCF51EM256 Series ColdFire Integrated Microcontroller Reference Manual, Rev. 8
Table 21-1
for the ADC and channel that the LCD V
CAUTION
NOTE
LL1
is
Freescale Semiconductor