MCF51EM256CLL Freescale Semiconductor, MCF51EM256CLL Datasheet - Page 512

• 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

Voltage Reference (VREF)
The voltage reference contains trim resolution of 0.5mV per step. The buffer has modes with improved
high-current swing output. In addition, a low-power buffer mode is available for use with ADCs or DACs.
The voltage reference can be output on a dedicated output pin
23.1.2
The Voltage Reference module has the following features:
23.1.3
The Voltage Reference continues normal operation in Run, Wait, LPRun, and LPWait modes. The Voltage
Reference module can be enabled to operate in STOP3 mode.
23.1.4
Table 23-1
1. In Tight-Regulation buffer mode, a 100nF capacitor is required to be connected between the VREFO pad and the ground.
23-2
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Programmable trim register with 0.5mV steps, automatically loaded with factory trimmed value
upon reset
Programmable mode selection:
— Off
— Bandgap out (or stabilization delay)
— Low-power buffer mode
— Tight-regulation buffer mode
1.2 V output at room temperature, 40 ppm/C
Dedicated output pin VREFO
Load regulation in tight-regulation mode of 100 uV/mA max
PSR of 0±0.1 mV DC and -60dB AC
shows the Voltage Reference signals properties.
Features
Modes of Operation
External Signal Description
MCF51EM256 Series ColdFire Integrated Microcontroller Reference Manual, Rev. 8
VREFO
Name
Internally generated voltage
reference output
Table 23-1. Signal Properties
Freescale Semiconductor
Function
1
.
I/O
O
Reset
—
Pull Up
—