MCF51EM256CLL Freescale Semiconductor, MCF51EM256CLL Datasheet - Page 514

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
Voltage Reference (VREF)
23.2.2
The VREF status and control register contains the control bits used to enable the internal voltage reference
and select the buffer mode to be used.
23.3
The Voltage Reference is a bandgap buffer system. Unity gain amplifiers are used.
The Voltage Reference can be used in two main cases. It can be used as a reference to analog peripherals
such as an ADC channel or analog comparator input. For this case, the low-power buffer can be used.
When the tight-regulation buffer is enabled, VREFO can be used both internally and externally.
Table 23-5
23-4
VREFEN MODE[1:0]
Register address: Base + 0x01
0
1
1
1
1
Reset:
Functional Description
W
R
shows all possible functional configurations of the Voltage Reference.
VREF Status and Control Register (VREFSC)
MCF51EM256 Series ColdFire Integrated Microcontroller Reference Manual, Rev. 8
MODE[1:0]
VREFEN
VREFST
00
01
10
11
X
Field
1:0
VREFEN
7
2
7
0
Figure 23-3. Voltage Reference Control Register (VREFSC)
Table 23-5. Voltage Reference Functional Configurations
Voltage Reference Disabled
Voltage Reference Enabled, Bandgap on
only
Voltage Reference Enabled, Low-Power
buffer on
Voltage Reference Enabled,
Tight-Regulation buffer on
Voltage Reference Disabled
Table 23-4. VREFSC Register Field Descriptions
Internal Voltage Reference Enable — This bit is used to enable the
Voltage Reference module.
0 the Voltage Reference module is disabled
1 the Voltage Reference module is enabled
Internal Voltage Reference Stable — This bit indicates that the Voltage
Reference module has completed its startup and stabilization.
0 Voltage Reference module is disabled or not stable
1 Voltage Reference module is stable
Mode selection — These bits are used to select the modes of operation for
the Voltage Reference module.
00 Bandgap on only, for stabilization and startup
01 Low-power buffer enabled
10 Tight-regulation buffer enabled
11 RESERVED
6
0
0
Configuration
Freescale Semiconductor
5
0
0
4
0
0
Description
Off
Startup and Standby
Can be used for internal peripherals only and
VREFO pin should not be loaded
Can be used both internally and externally. A
100nF capacitor is required on VREFO and
10mA max drive strength is allowed.
RESERVED
3
0
0
VREFST
2
0
Functionality
1
0
MODE
0
0

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