MCF51EM256CLL Freescale Semiconductor, MCF51EM256CLL Datasheet - Page 489

• 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

The resulting conversion time is generated using the parameters listed in
equal to 8 MHz and ADCK equal to 1 MHz the resulting conversion time is 57.625 μs (AverageNum).
This results in a total conversion time of 1.844 ms.
21.5.5.7
The hardware average function can be enabled (AVGE=1) to perform a hardware average of multiple
conversions. The number of conversions is determined by the AVGS[1:0] bits, which select 4, 8, 16 or 32
conversions to be averaged. While the hardware average function is in progress, the ADACT bit is set.
After the selected input is sampled and converted, the result is placed in an accumulator from which an
average is calculated once the selected number of conversions has been completed. When hardware
averaging is selected the completion of a single conversion will not set the COCOn bit.
If the compare function is either disabled or evaluates true, after the selected number of conversions are
completed, the average conversion result is transferred into the data result registers, ADCRHn and
ADCRLn, and the COCOn bit is set. An ADC interrupt is generated upon the setting of COCOn if the
respective ADC interrupt is enabled (AIENn=1).
21.5.6
The compare function can be configured to check if the result is less than or greater-than-or-equal-to a
single compare value, or if the result falls within or outside a range determined by two compare values.
The compare mode is determined by ACFGT, ACREN and the values in the compare value
registers(ADCCV1H:ADCCV1L and ADCCV2H:ADCCV2L). After the input is sampled and converted,
Freescale Semiconductor
Automatic Compare Function
Hardware Average Function
The hardware average function can perform conversions on a channel while
the MCU is in wait or stop3 mode. The ADC interrupt wakes the MCU
when the hardware average is complete if AIENn was set.
MCF51EM256 Series ColdFire Integrated Microcontroller Reference Manual, Rev. 8
AverageNum
HSCAdder
SFCAdder
LSTAdder
Variable
BCT
Table 21-23. Typical Conversion Time
3 ADCK cycles + 5 bus clock cycles
NOTE
34 ADCK cycles
20 ADCK cycles
Time
32
0
Table
Analog-to-Digital Converter (S08ADC16)
21-24. So, for Bus clock
21-33