MCIMX286CVM4B Freescale Semiconductor, MCIMX286CVM4B Datasheet - Page 1478

• Manufacturer Part Number: MCIMX286CVM4B
• Description: IC MPU I.MX286 289MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: i.MX28r

Specifications of MCIMX286CVM4B

• 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: Compliant

RTC Overview
the persistent seconds count register. Like the values of the other persistent registers, the
value of the persistent seconds count register is not lost across a power-down state and will
continue to count seconds during that time.
Contrary to the one-second time base, no record or count is made of the one-millisecond
time base in the crystal power domain. The one-millisecond time base is always derived
from the 24.0-MHz crystal oscillator, but is not available when the chip is powered down.
The real-time clock seconds counter, alarm functions, and persistent bit storage are kept in
the (always on) crystal power domain. Shadow versions of these values are maintained in
the CPU's power and APBX clock domain when the chip is in the power-up state. When
the chip transitions from power-off to power-on, the master values are copied to shadow
registers by the copy controller. Whenever software writes to a shadow register, then the
copy controller copies the new value into the master register in the crystal oscillator power
domain.
Some of the persistent bits are used to control features that can continue to operate after
power-down, such as the second counter and the alarm function and bits in the
HW_RTC_PERSISTENT0 register. The bits in registers HW_RTC_PERSISTENT1 through
HW_RTC_PERSISTENT5 are available to store application state information over
power-downs and are completely software-defined.
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
1478
Freescale Semiconductor, Inc.