MCIMX281AVM4B Freescale Semiconductor, MCIMX281AVM4B Datasheet - Page 1504
MCIMX281AVM4B
Manufacturer Part Number
MCIMX281AVM4B
Description
IC MPU I.MX28 1.2 289MAPBGA
Manufacturer
Freescale Semiconductor
Series
i.MX28r
Datasheets
1.MCIMX283DVM4B.pdf
(2327 pages)
2.MCIMX283DVM4B.pdf
(20 pages)
3.MCIMX281AVM4B.pdf
(72 pages)
Specifications of MCIMX281AVM4B
Core Processor
ARM9
Core Size
32-Bit
Speed
454MHz
Connectivity
CAN, EBI/EMI, Ethernet, I²C, MMC, SmartCard, SPI, SSI, UART/USART, USB OTG
Peripherals
DMA, I²S, LCD, POR, PWM, WDT
Program Memory Size
128KB (32K x 32)
Program Memory Type
Mask ROM
Ram Size
32K x 32
Voltage - Supply (vcc/vdd)
1.25 V ~ 5.25 V
Data Converters
A/D 17x12b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
289-LFBGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Number Of I /o
-
Eeprom Size
-
Lead Free Status / Rohs Status
Supplier Unconfirmed
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Timer
returns to its default start value 0xFFFF_FFFF, then starts decrementing from 0xFFFF_FFFF
to 0. Every time it decreases to 0, it restores to 0xFFFF_FFFF and keeps decreasing
repeatedly. During this ceaseless decrement, interrupt is triggered every time free running
count equals match count.
Figure 23-3
In match mode, period timer interrupt can be triggered by modifying the match register to
a proper value adequately smaller than the current value of the match register in every
interrupt service routine, which is usually calculated by subtracting a delta from the current
value of the match register. To get a group of interrupts with fixed interval, constant delta
is used, and to get interrupts with variable interval, variable delta is used.
Any timer interrupt can be programmed as a FIQ or as a regular IRQ. See
(ICOLL) Overview
For proper detection of the input source signal, it should be much slower than the pre-scaled
APBX clock (not greater than one-third the frequency of the pre-scaled APBX clock).
Selecting the ALWAYS tick causes the timer to decrement continuously at the rate
established by the pre-scaled APBX clock. The NEVER TICK selection causes the timer
to stall.
1504
shows a detailed view of each timer in match mode.
Figure 23-3. Timer 0, Timer 1, Timer 2 or Timer 3 Detail
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
for programming details.
NEVER TICK
ROTARY_A
ROTARY_B
ALWAYS TICK
PWM[0]
PWM[1]
PWM[2]
PWM[3]
PWM[4]
PWM[5]
PWM[6]
PWM[7]
32-kHz
Input
32-Bit Match Count
Timer I/O
24-MHz
XTAL
Osc.
Divide
by n
Detect
Edge
APBX clk
Controller
Tick
Mode
Divide by
1, 2, 4, 8
match_mode == 1
32-Bit Running Count
== match & match_mode
Gated clk
?
Freescale Semiconductor, Inc.
Interrupt Collector
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