MCF5253CVM140 Freescale Semiconductor, MCF5253CVM140 Datasheet - Page 192

• Manufacturer Part Number: MCF5253CVM140
• Description: IC MPU 32BIT 140MHZ 225-MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: MCF525xr

Specifications of MCF5253CVM140

• 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: -40°C ~ 85°C
• Package / Case: 225-MAPBGA
• Family Name: MCF5xxx
• Device Core: ColdFire V2
• Device Core Size: 32b
• Frequency (max): 140MHz
• Instruction Set Architecture: RISC
• Supply Voltage 1 (typ): 1.2/3.3V
• Operating Supply Voltage (max): 1.32/3.6V
• Operating Supply Voltage (min): 1.08/3V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 225
• Package Type: MA-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of I /o: -
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: Compliant

General Purpose Timer Modules
11.6.5
There are two timers on the MCF5253. With a 70 MHz clock, the maximum period is 3.83 seconds and a
resolution of 14.3 ns. The timers can be free running or count to a value and reset. The following examples
set up the timers:
Timer0 will count to $AFAF, toggle its output, and reset back to $0000. This will continue infinitely until
the timer is disabled or a reset occurs. No interrupts are set. Prescale is set at 256 and the system clock is
divided by 16, therefore resolution is (16 × (256))/70 MHz = 58.51us. Timeout period is
(16 × 256 × 44976)/70 MHz = 2.63s ($0 - $AFAF = 44976 decimal).
Autovectors and ICRs have been set up as follows. The interrupt levels and priorities were chosen by
random for demonstrative purposes. Users should define the interrupt level and priorities for their specific
application.
11.6.5.1
Bits 15:8 sets the prescale to 256 ($FF)
Bits 7:6 set for no interrupt (“00”)
Bits 5:4 sets output mode for “toggle”. No interrupts(“10”)
Bits 3 set for “restart” (“1”)
Bits 2:1 set the clocking source to system clock/16 (“10”)
Bit 0 enables/disables the timer (“0”)
11.6.5.2
The TRR register is set to $AFAF. The timer will count up to this value (TCN = TRR), toggle the “TOUT”
pin, and reset the TCN to $0000.
Other registers used for TIMER 0
TCR0;TIMER0 Capture Register, 16-bit, R
TER0;TIMER0 Event Register, 8-bit, R/W
11-6
move.w #$FF2C,D0;Setup the Timer mode register (TMR0)
move.w D0,TMR1;
move.w #$0000,D0; writing to the timer counter with any value resets it to zero
move.w D0,TCN1;
move.w #$AFAF,D0;Setup the Timer reference register (TRR0)
move.w D0,TRR1
Timer Initialization Example Code
Timer0 (Timer Mode Register)
Timer0 (Timer Reference Register0)
The timers were initialized in the SIM to have interrupt values. The
following examples have the interrupts disabled. The initialization in the
SIM configuration was for reference. The Timers CANNOT provide
interrupt vectors, only autovectors.
MCF5253 Reference Manual, Rev. 1
NOTE
Bit 1 is set to 0 to disable the timer
Freescale Semiconductor