DSPIC33EP256MU806-I/PT Microchip Technology, DSPIC33EP256MU806-I/PT Datasheet - Page 414

• Manufacturer Part Number: DSPIC33EP256MU806-I/PT
• Description: 64 PINS, 256KB Flash, 28KB RAM, 60 MHz, USB, 2xCAN, 15 DMA 64 TQFP 10x10x1mm TRA
• Manufacturer: Microchip Technology
• Series: dsPIC™ 33EPr

Specifications of DSPIC33EP256MU806-I/PT

• Embedded Interface Type: I2C, SPI, UART
• No. Of I/o's: 51
• Flash Memory Size: 280KB
• Supply Voltage Range: 3V To 3.6V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: TQFP
• No. Of Pins: 64
• Rohs Compliant: Yes
• Core Processor: dsPIC
• Core Size: 16-Bit
• Speed: 60 MIPs
• Connectivity: CAN, I²C, IrDA, LIN, QEI, SPI, UART/USART, USB OTG
• Peripherals: Brown-out Detect/Reset, DMA, Motor Control PWM, POR, PWM, WDT
• Number Of I /o: 51
• Program Memory Size: 256KB (85.5K x 24)
• Program Memory Type: FLASH
• Eeprom Size: -
• Ram Size: 12K x 16
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 24x10b/12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

dsPIC33EPXXXMU806/810/814 and PIC24EPXXXGU810/814
26.1
The user application can configure the time and
calendar by writing the desired seconds, minutes,
hours, weekday, date, month, and year to the RTCC
registers. Under normal operation, writes to the RTCC
timer registers are not allowed. Attempted writes will
appear to execute normally, but the contents of the
registers will remain unchanged. To write to the RTCC
register, the RTCWREN bit (RCFGCAL<13>) must be
set. Setting the RTCWREN bit allows writes to the
RTCC registers. Conversely, clearing the RTCWREN
bit prevents writes.
DS70616E-page 414
Note:
Writing to the RTCC Timer
To allow the RTCC module to be clocked
by the secondary crystal oscillator, the
Secondary Oscillator Enable (LPOSCEN)
bit
(OSCCON<1>) register must be set. For
further
Section 7. “Oscillator” (DS70580) in the
'dsPIC33E/PIC24E
Manual'.
in
the
details,
Oscillator
Family
refer
Reference
Control
Preliminary
to
To set the RTCWREN bit, the following procedure must
be executed. The RTCWREN bit can be cleared at any
time:
1.
2.
3.
The RTCC module is enabled by setting the RTCEN bit
(RCFGCAL<15>). To set or clear the RTCEN bit, the
RTCWREN bit (RCFGCAL<13>) must be set.
If the entire clock (hours, minutes, and seconds) needs
to be corrected, it is recommended that the RTCC
module should be disabled to avoid coincidental write
operation when the timer increment. Therefore, it stops
the clock from counting while writing to the RTCC Timer
register.
Write 0x55 to NVMKEY.
Write 0xAA to NVMKEY.
Set the RTCWREN bit using a single cycle
instruction.
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