DSPIC33FJ12GP201 datasheet(2/6 Pages) MICROCHIP

2 / 6 page

dsPIC33FJ12GP201/202

DS80327A-page 2

1. Module: JTAG Programming

JTAG programming does not work.

Work around

None.

2. Module: UART

UART receptions may be corrupted if the Baud

Rate Generator is set up for 4x mode (BRGH = 1).

Work around

Use the 16x baud rate option (BRGH = 0) and

adjust the baud rate accordingly.

3. Module: UART

The auto-baud feature may not calculate the

correct baud rate when the High Baud Rate Enable

bit, BRGH, is set. With the BRGH bit set, the baud

rate calculation used is the same as BRG = 0.

Work around

If the auto-baud feature is needed, use the Low

Baud Rate mode by clearing the BRGH bit.

4. Module: UART

With the auto-baud feature selected, the Sync

Break character (0x55) may be loaded into the

FIFO as data.

Work around

To prevent the Sync Break character from being

loaded into the FIFO, load the UxBRG register with

either 0x0000 or 0xFFFF prior to enabling the

auto-baud feature (ABAUD = 1).

5. Module: UART

The auto-baud feature may miscalculate for

certain baud rate and clock speed combinations,

resulting in a BRG value that is greater than or less

than the expected value by 1. This may result in

reception or transmission failures.

Work around

Test the auto-baud rate at various clock speed and

baud rate combinations that would be used in an

application. If an inaccurate BRG value is

generated, manually correct the baud rate in user

software.

6. Module: Traps and Idle Mode

If a clock failure occurs when the device is in Idle

mode, the oscillator failure trap does not vector to

the Trap Service Routine. Instead, the device will

simply wake-up from Idle mode and continue code

execution if the Fail-Safe Clock Monitor (FSCM) is

enabled.

Work around

Whenever the device wakes up from Idle (assum-

ing the FSCM is enabled) the user software should

check the state of the OSCFAIL bit (INTCON1<1>)

to determine whether a clock failure occurred, and

then perform the appropriate clock switch

operation.

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