MCF51EM256CLL Freescale Semiconductor, MCF51EM256CLL Datasheet - Page 511

• 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

Chapter 23
Voltage Reference (VREF)
23.1
The Voltage Reference (VREF) is intended to supply an accurate voltage output that is trimmable by an
8-bit register in 0.5 mV steps. This reference can be used to provide a reference voltage to external devices
or internal analog peripherals such as the ADC, DAC, or ACMP. The voltage reference has two operation
modes that provide different levels of load regulation and power consumption.
diagram of the Voltage Reference.
23.1.1
The Voltage Reference optimizes the existing bandgap and bandgap buffer system. Unity gain amplifiers
ease the design and keep power consumption low. The 8-bit trim register is user accessible so that the
voltage reference can be trimmed in application.
Freescale Semiconductor
VREFSC_VREFEN
VREFSC_MODE
VREFTRIM
Introduction
Overview
MCF51EM256 Series ColdFire Integrated Microcontroller Reference Manual, Rev. 8
2 BITS
8 BITS
Figure 23-1. Voltage Reference Block Diagram
BANDGAP
TIGHT-REGULATION
LOW-POWER
+
–
+
–
BUFFER
BUFFER
Figure 23-1
VREFO
100nF
1. This cap is required
in tight-regulation
buffer mode only
otherwise this cap
should be removed.
1
is a block
VREFO
VREFST
DEDICATED
OUTPUT PIN
23-1