MC56F8257MLH Freescale Semiconductor, MC56F8257MLH Datasheet - Page 478

• Manufacturer Part Number: MC56F8257MLH
• Description: DSC 64K FLASH 60MHZ 64-LQFP
• Manufacturer: Freescale Semiconductor
• Series: 56F8xxxr

Specifications of MC56F8257MLH

• Core Processor: 56800E
• Core Size: 16-Bit
• Speed: 60MHz
• Connectivity: CAN, I²C, LIN, SCI, SPI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 54
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Ram Size: 4K x 16
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x12b, D/A 1x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 64-LQFP
• Product: DSCs
• Processor Series: 56800E
• Core: 56800E
• Device Million Instructions Per Second: 60 MIPs
• Maximum Clock Frequency: 60 MHz
• Number Of Programmable I/os: 54
• Data Ram Size: 8 KB
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit, 8 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

Modes of Operation
When entering the power down mode, the MSCAN immediately stops all ongoing
transmissions and receptions, potentially causing CAN protocol violations. To protect the
CAN bus system from fatal consequences of violations to the above rule, the MSCAN
immediately drives the TXCAN pin into a recessive state.
In power down mode, all clocks are stopped and no registers can be accessed. If the
MSCAN was not in sleep mode before power down mode became active, the module
performs an internal recovery cycle after powering up. This causes some fixed delay
before the module enters normal mode again.
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13.4.5.7 Programmable Wake-Up Function
The MSCAN can be programmed to wake up the MSCAN as soon as CAN bus activity is
detected (see control bit WUPE). The sensitivity to existing CAN bus action can be
modified by applying a low-pass filter function to the RXCAN input line while in sleep
mode (see control bit WUPM).
This feature can be used to protect the MSCAN from wake-up due to short glitches on the
CAN bus lines. Such glitches can result from—for example—electromagnetic
interference within noisy environments.
13.4.6 Reset Initialization
The reset state of each individual bit is listed in the register definitions, which detail all
the registers and their bitfields.
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• CPU is in wait mode and the CSWAI bit is set
or
The user is responsible for ensuring that the MSCAN is not
active when power down mode is entered. The recommended
procedure is to bring the MSCAN into Sleep mode before the
STOP or WAIT instruction (if CSWAI is set) is executed.
Otherwise, the abort of an ongoing message can cause an error
condition and impact other CAN bus devices.
MC56F825x/4x Reference Manual, Rev. 2, 10/2010
Preliminary
Note
Freescale Semiconductor