AT91M55800A-33CJ Atmel, AT91M55800A-33CJ Datasheet - Page 76

• Manufacturer Part Number: AT91M55800A-33CJ
• Description: IC ARM MCU 16BIT 176BGA
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91M55800A-33CJ

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 33MHz
• Connectivity: EBI/EMI, SPI, UART/USART
• Peripherals: POR, WDT
• Number Of I /o: 58
• Program Memory Type: ROMless
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 176-LFBGA
• Processor Series: AT91Mx
• Core: ARM7TDMI
• Data Bus Width: 32 bit
• Data Ram Size: 8 KB
• Interface Type: EBI, SPI, USART
• Maximum Clock Frequency: 33 MHz
• Number Of Programmable I/os: 58
• Number Of Timers: 10 bit
• Operating Supply Voltage: 3 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: JTRACE-ARM-2M, MDK-ARM, RL-ARM, ULINK2
• Development Tools By Supplier: AT91EB55
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• On-chip Dac: 8 bit, 2 Channel
• Cpu Family: AT91
• Device Core: ARM7TDMI
• Device Core Size: 32b
• Frequency (max): 33MHz
• Program Memory Size: Not Required
• Total Internal Ram Size: 8KB
• # I/os (max): 58
• Number Of Timers - General Purpose: 6
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.6V
• Operating Supply Voltage (min): 2.7V
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 176
• Package Type: BGA
• For Use With: AT91EB55 - KIT EVAL FOR ARM AT91M55800A
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

13.2.4
76
AT91M5880A
Updating Time/Calendar
Note:
To update any of the time/calendar fields, the user must first stop the RTC by setting the corre-
sponding field in the Mode Register (RTC_MR). Bit UPDTIM must be set to update time fields
(hour, minute, second) and bit UPDCAL must be set to update calendar fields (century, year,
month, date, day).
Then the user must poll or wait for the interrupt (if enabled) of bit ACKUPD in the Status Register
(RTC_SR). Once the bit reads 1 (the user must clear this status bit by writing ACKUPD to 1 in
RTC_SCR), the user can write to the appropriate register.
Once the update is finished, the user must reset (0) UPDTIM and/or UPDCAL in the Mode Reg-
ister (RTC_MR).
When programming the calendar fields, the time fields remain enabled. This avoids a time slip in
case the user stays in the calendar update phase for several tens of seconds or more.
6. Hour (BCD check, in 24-hour mode check range 00 - 23 and check that AM/PM flag is
7. Minute (check BCD and range 00 - 59)
8. Second (check BCD and range 00 - 59)
not set if RTC is set in 24-Hour mode, in 12-Hour mode check range 01 - 12)
If the 12-hour mode is selected by means of the RTC_MODE register, a 12-hour value can be pro-
grammed and the returned value on RTC_TIME will be the corresponding 24-hour value. The
entry control checks the value of the AM/PM indicator (bit 22 of RTC_TIME register) to determine
the range to be checked.
1745F–ATARM–06-Sep-07