MCF5253VM140J Freescale Semiconductor, MCF5253VM140J Datasheet - Page 360

• Manufacturer Part Number: MCF5253VM140J
• Description: IC MCU 2.1MIPS 140MHZ 225MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: MCF525xr

Specifications of MCF5253VM140J

• Core Processor: Coldfire V2
• Core Size: 32-Bit
• Speed: 140MHz
• Connectivity: CAN, EBI/EMI, I²C, QSPI, UART/USART, USB OTG
• Peripherals: DMA, WDT
• Program Memory Type: ROMless
• Ram Size: 128K x 8
• Voltage - Supply (vcc/vdd): 1.08 V ~ 1.32 V
• Data Converters: A/D 6x12b
• Oscillator Type: External
• Operating Temperature: -20°C ~ 70°C
• Package / Case: 225-MAPBGA
• Processor Series: MCF525x
• Core: ColdFire V2
• 3rd Party Development Tools: JLINK-CF-BDM26, EWCF
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of I /o: -
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: Details

I
18.6.7
If several devices try to engage the bus at the same time, only one becomes master and the others lose
arbitration. The devices that lost arbitration are immediately switched to slave receive mode by the
hardware. Their data output to the SDA line is stopped, but SCL is still generated until the end of the byte
during which arbitration was lost. An interrupt occurs at the falling edge of the ninth clock of this transfer
with IAL=1 and MSTA=0. If one master tries to transmit or do a START while the bus is being engaged
by another master, the hardware does the following:
When considering these cases, the slave service routine should test the IAL first and the software should
clear the IAL bit if it is set.
18-16
2
C Modules
1. Inhibits the transmission
2. Switches the MSTA bit from 1 to 0 without generating STOP condition
3. Generates an interrupt to CPU
4. Sets the IAL to indicate the failed attempt to engage the bus
Arbitration Lost
MCF5253 Reference Manual, Rev. 1
Freescale Semiconductor