MCF5270CAB100 Freescale Semiconductor, MCF5270CAB100 Datasheet - Page 419

• Manufacturer Part Number: MCF5270CAB100
• Description: MCU V2 COLDFIRE 64K SRAM 160-QFP
• Manufacturer: Freescale Semiconductor
• Series: MCF527xr

Specifications of MCF5270CAB100

• Core Processor: Coldfire V2
• Core Size: 32-Bit
• Speed: 100MHz
• Connectivity: EBI/EMI, Ethernet, I²C, SPI, UART/USART
• Peripherals: DMA, WDT
• Number Of I /o: 39
• Program Memory Type: ROMless
• Ram Size: 64K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 160-QFP
• Processor Series: MCF527x
• Core: ColdFire V2
• 3rd Party Development Tools: JLINK-CF-BDM26, EWCF
• Development Tools By Supplier: NNDK-MOD5272-KIT, NNDK-MOD5270-KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

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T0_FINISH
22.3.2 Calculating Time-Out Values
The formula below determines time-out periods for various reference values:
When calculating time-out periods, add 1 to the prescaler to simplify calculating, because
DTMRn[PS] = 0x00 yields a prescaler of 1 and DTMRn[PS] = 0xFF yields a prescaler of 256.
For example, if a 75-MHz timer clock is divided by 16, DTMRn[PS] = 0x7F, and the timer is
referenced at 0x11E1A (73,242 decimal), the time-out period is as follows:
Freescale Semiconductor
Time-out period = (1/clock frequency) x (1 or 16) x (DTMRn[PS] + 1) x (DTRRn[REF] + 1)
btst #1,D1
beq T0_LOOP
addi.l #1,D2
cmp.l #5,D2
beq T0_FINISH
move.b #0x02,D0
move.b D0,TER0
jmp T0_LOOP
HALT
Time-out period = [1/(75 x 10
MCF5271 Reference Manual, Rev. 2
;TER0[REF] has been set
6
)] x (16) x (127 + 1) x (73,242 + 1) = 2.00 s
;Increment D2
;Did D2 reach 5? (i.e. timer ref has timed)
;If so, end timer0 example. Otherwise jump
;writing one to TER0[REF] clears the event
;End processing. Example is finished
Using the DMA Timer Modules
22-11