MC56F8257MLH Freescale Semiconductor, MC56F8257MLH Datasheet - Page 477

• 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

In initialization mode, the MSCAN is stopped. However, interface registers remain
accessible. This mode is used to reset the CAN_CTL0, CAN_RFLG, CAN_RIER,
CAN_TFLG, CAN_TIER, CAN_TARQ, CAN_TAAK, and CAN_TBSEL registers to
their default values. In addition, the MSCAN enables the configuration of the
CAN_BTR0, CAN_BTR1 bit timing registers; CAN_IDAC; and the CAN_IDAR,
CAN_IDMR message filters.
Due to independent clock domains within the MSCAN, INITRQ must be synchronized to
all domains by using a special handshake mechanism. This handshake causes additional
synchronization delay.
If there is no message transfer ongoing on the CAN bus, the minimum delay will be two
additional bus clocks and three additional CAN clocks. When all parts of the MSCAN are
in initialization mode, the INITAK flag is set. The application software must use INITAK
as a handshake indication for the request (INITRQ) to go into initialization mode.
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13.4.5.6 MSCAN Power Down Mode
The MSCAN is in power down mode when
Freescale Semiconductor
• CPU is in stop mode
CAN_CTL0 register. Otherwise, the abort of an on-going
message can cause an error condition and can impact other
CAN bus devices.
The CPU cannot clear INITRQ before initialization mode
(INITRQ = 1 and INITAK = 1) is active.
Bus Clock Domain
CPU
Init Request
Figure 13-88. Initialization Request/Acknowledge Cycle
INITAK
Flag
MC56F825x/4x Reference Manual, Rev. 2, 10/2010
INITRQ
sync.
INITAK
Chapter 13 Freescale's Scalable Controller Area Network (MSCAN)
Preliminary
Note
SYNC
SYNC
CAN Clock Domain
sync.
INITRQ
INITAK
INIT
Flag
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