MCIMX286CVM4B Freescale Semiconductor, MCIMX286CVM4B Datasheet - Page 1489

• 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

Address:
Re-
22.8.4 Real-Time Clock Seconds Counter (HW_RTC_SECONDS)
The real-time clock seconds counter is used to maintain real time for applications, even
across certain chip power-down states.
HW_RTC_SECONDS: 0x030
HW_RTC_SECONDS_SET: 0x034
HW_RTC_SECONDS_CLR: 0x038
HW_RTC_SECONDS_TOG: 0x03C
HW_RTC_SECONDS provides access to the 32-bit real-time seconds counter. Both the
shadow register on the digital side and the analog side register update every second. When
the chip enters the power-down state, the shadow register is powered down and loses its
state value. When the chip powers up, the analog side register contents are automatically
copied to the shadow register. The reset value of 0x0 for the digital side register is only
visible until the copy controller overwrites with the value from the analog side. The analog
side register resets to zero only upon power-on reset (POR), i.e., when the battery is first
inserted or whenever a battery-less part is plugged into USB power or into a wall transformer.
Note that if a low frequency (32.000khz or 32.768khz) crystal is available in the system,
then the seconds count and the milliseconds count will be derived from different clocks.
Namely, the msec count is derived from the 24MHz crystal and the seconds count from the
low-frequency crystal. This limits the precision of the relation between these two clocks.
EXAMPLE
This value will
Freescale Semiconductor, Inc.
set
Bit
W
R
31
0
COUNT
Field
31 0
30
0
29
0
HW_RTC_MILLISECONDS
28
0
HW_RTC_SECONDS_WR(0);
rt_clock = HW_RTC_SECONDS_RD(); // read the 32 seconds counter value
32 bit milliseconds counter.
27
0
26
0
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
25
0
24
HW_RTC_MILLISECONDS field descriptions
0
23
0
22
0
21
0
8005_6000h base + 20h offset = 8005_6020h
20
0
19
0
18
0
17
0
// write an initial value to the digital side.
// be automatically copied to the analog side
COUNT
Chapter 22 Real-Time Clock Alarm Watchdog Persistent Bits
16
0
15
0
Description
14
0
13
0
12
0
11
0
10
0
0
9
0
8
0
7
0
6
0
5
0
4
3
0
0
2
0
1
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0