PIC24FJ128GA008-I/PT Microchip Technology, PIC24FJ128GA008-I/PT Datasheet - Page 160

• Manufacturer Part Number: PIC24FJ128GA008-I/PT
• Description: IC PIC MCU FLASH 128K 80TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 24Fr

Specifications of PIC24FJ128GA008-I/PT

• Program Memory Type: FLASH
• Program Memory Size: 128KB (43K x 24)
• Package / Case: 80-TFQFP
• Core Processor: PIC
• Core Size: 16-Bit
• Speed: 16MHz
• Connectivity: I²C, PMP, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 69
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 3.6 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC24FJ
• Core: PIC
• Data Bus Width: 16 bit
• Data Ram Size: 8 KB
• Interface Type: SPI/I2C/USART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 54
• Number Of Timers: 5
• Operating Supply Voltage: 2 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52713-733, 52714-737, 53276-922, EWDSPIC
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, DM240001, DM240011, DV164033, MA240011, AC164127
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 16-ch x 10-bit
• Controller Family/series: PIC24
• No. Of I/o's: 69
• Ram Memory Size: 8KB
• Cpu Speed: 32MHz
• No. Of Timers: 5
• Embedded Interface Type: EUART, I2C, PSP, SPI
• Rohs Compliant: Yes
• Package: 80TQFP
• Device Core: PIC
• Family Name: PIC24
• Maximum Speed: 16 MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 876-1004 - PIC24 BREAKOUT BOARDDM240011 - KIT STARTER MPLAB FOR PIC24F MCUMA160011 - DAUGHTER BOARD PICDEM LCD 16F91XDM240001 - BOARD DEMO PIC24/DSPIC33/PIC32AC164328 - MODULE SKT FOR 80TQFP
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC24FJ128GA FAMILY
REGISTER 18-10: ALMINSEC: ALARM MINUTES AND SECONDS VALUE REGISTER
18.2
The real-time crystal input can be calibrated using the
periodic auto-adjust feature. When properly calibrated,
the RTCC can provide an error of less than 3 seconds
per month. This is accomplished by finding the number
of error clock pulses and storing the value into the
lower half of the RCFGCAL register. The 8-bit signed
value loaded into the lower half of RCFGCAL is multi-
plied by four and will be either added or subtracted from
the RTCC timer, once every minute. Refer to the steps
below for RTCC calibration:
1.
2.
DS39747C-page 158
bit 15
bit 14-12 MINTEN2:MINTEN0: Binary Coded Decimal Value of Minute’s Tens Digit; Contains a value from 0 to 5
bit 11-8
bit 7
bit 6-4
bit 3-0
Upper Byte:
bit 15
Using another timer resource on the device, the
user must find the error of the 32.768 kHz
crystal.
the number of error clock pulses per minute.
Formula box:
(Ideal frequency (32,768) – measured frequency)
* 60 = clocks per minute
Once the error is known, it must be converted to
U-0
—
Calibration
Unimplemented: Read as ‘0’
MINONE3:MINONE0: Binary Coded Decimal Value of Minute’s Ones Digit; Contains a value from 0 to 9
Unimplemented: Read as ‘0’
SECTEN2:SECTEN0: Binary Coded Decimal Value of Second’s Tens Digit; Contains a value from 0 to 5
SECONE3:SECONE0: Binary Coded Decimal Value of Second’s Ones Digit; Contains a value from 0 to 9
Legend:
R = Readable bit
-n = Value at POR
MINTEN2
R/W-x
Lower Byte:
bit 7
U-0
—
MINTEN1
R/W-x
SECTEN2 SECTEN1 SECTEN0 SECONE3 SECONE2 SECONE1 SECONE0
R/W-x
MINTEN0
W = Writable bit
‘1’ = Bit is set
R/W-x
R/W-x
Preliminary
MINONE3
R/W-x
R/W-x
3.
4.
Writes to the lower half of the RCFGCAL register
should only occur when the timer is turned off, or
immediately after the rising edge of the seconds pulse.
MINONE2
Note:
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
R/W-x
a) If the oscillator is faster then ideal (negative
result form step 2), the RCFGCAL register value
needs to be negative. This causes the specified
number of clock pulses to be subtracted from
the timer counter once every minute.
b) If the oscillator is slower then ideal (positive
result from step 2) the RCFGCAL register value
needs to be positive. This causes the specified
number of clock pulses to be subtracted from
the timer counter once every minute.
Load the RCFGCAL register with the correct
value.
R/W-x
It is up to the user to include in the error
value the initial error of the crystal, drift
due to temperature and drift due to crystal
aging.
MINONE1
R/W-x
R/W-x
© 2006 Microchip Technology Inc.
MINONE0
R/W-x
x = Bit is unknown
R/W-x
bit 8
R/W-x
bit 0