LPC1837FET256,551 NXP Semiconductors, LPC1837FET256,551 Datasheet - Page 707

• Manufacturer Part Number: LPC1837FET256,551
• Description: Microcontrollers (MCU) 32BIT ARM CORTEX-M3 MCU 136KB SRAM
• Manufacturer: NXP Semiconductors
• Series: LPC18xxr

Specifications of LPC1837FET256,551

• Core: ARM Cortex M3
• Core Processor: ARM® Cortex-M3™
• Core Size: 32-Bit
• Speed: 150MHz
• Connectivity: CAN, EBI/EMI, Ethernet, I²C, Microwire, SD/MMC, SPI, SSI, SSP, UART/USART, USB OTG
• Peripherals: Brown-out Detect/Reset, DMA, I²S, Motor Control PWM, POR, PWM, WDT
• Number Of I /o: 80
• Program Memory Size: 1MB (1M x 8)
• Program Memory Type: FLASH
• Eeprom Size: -
• Ram Size: 136K x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 3.6 V
• Data Converters: A/D 16x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 256-LBGA
• Lead Free Status / Rohs Status: Details
• Other names: 935293795551

NXP Semiconductors
<Document ID>
User manual
31.6.6.1 Leap year calculation
31.6.6.2 Calibration register
Table 648. Days of year register (DOY - address 0x4004 6034) bit description
[1]
Table 649. Month register (MONTH - address 0x4004 6038) bit description
[1]
Table 650. Year register (YEAR - address 0x4004 603C) bit description
[1]
The RTC does a simple bit comparison to see if the two lowest order bits of the year
counter are zero. If true, then the RTC considers that year a leap year. The RTC considers
all years evenly divisible by 4 as leap years. This algorithm is accurate from the year 1901
through the year 2099, but fails for the year 2100, which is not a leap year. The only effect
of leap year on the RTC is to alter the length of the month of February for the month, day
of month, and year counters.
The following register is used to calibrate the time counter. The bits in this register are not
changed by reset.
Table 651. Calibration register (CALIBRATION - address 0x4004 6040) bit description
Bit
8:0
31:9
Bit
3:0
31:4
Bit
11:0
31:4
Bit
16:0
This register value is not changed by reset.
This register value is not changed by reset.
This register value is not changed by reset.
Symbol
CALVAL
Symbol
DOY
-
Symbol
MONTH
-
Symbol
YEAR
-
All information provided in this document is subject to legal disclaimers.
Value
-
Rev. 00.13 — 20 July 2011
Description
Day of year value in the range of 1 to 365 (366 for leap years).
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
Description
Month value in the range of 1 to 12.
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
Description
Year value in the range of 0 to 4095.
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
Description
If enabled, the calibration counter counts up to this value.
The maximum value is 131072 corresponding to about 36.4
hours. Calibration is disabled if CALVAL = 0.
Chapter 31: LPC18xx Real-Time Clock (RTC)
UM10430
© NXP B.V. 2011. All rights reserved.
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Reset
value
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Reset
value
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Reset
value
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Reset
value
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-
[1]
[1]
[1]
[1]