MC56F8257MLH Freescale Semiconductor, MC56F8257MLH Datasheet - Page 476

• 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
If the WUPE bit in CAN_CTL0 is not asserted, the MSCAN will mask any activity it
detects on CAN. The RXCAN pin is therefore held internally in a recessive state. This
locks the MSCAN in sleep mode. WUPE must be set before entering sleep mode to take
effect.
The MSCAN is able to leave sleep mode (wake) only when:
After wakeup, the MSCAN waits for 11 consecutive recessive bits to synchronize to the
CAN bus. As a consequence, if the MSCAN is awakened by a CAN frame, this frame is
not received.
The receive message buffers (RxFG and RxBG) contain messages if they were received
before sleep mode was entered. All pending actions will be executed upon wakeup;
copying of RxBG into RxFG, message aborts and message transmissions. If the MSCAN
remains in bus-off state after sleep mode was exited, it continues counting the 128
occurrences of 11 consecutive recessive bits.
>
13.4.5.5 MSCAN Initialization Mode
In initialization mode, any on-going transmission or reception is immediately aborted and
synchronization to the CAN bus is lost, potentially causing CAN protocol violations. To
protect the CAN bus system from fatal consequences of violations, the MSCAN
immediately drives the TXCAN pin into a recessive state.
476
• CAN bus activity occurs and WUPE = 1
• the CPU clears the SLPRQ bit
or
The CPU cannot clear the SLPRQ bit before sleep mode
(SLPRQ = 1 and SLPAK = 1) is active.
The user is responsible for ensuring that the MSCAN is not
active when initialization mode is entered. The recommended
procedure is to bring the MSCAN into sleep mode (SLPRQ = 1
and SLPAK = 1) before setting the INITRQ bit in the
MC56F825x/4x Reference Manual, Rev. 2, 10/2010
Preliminary
Note
Note
Freescale Semiconductor