Information

 2009-2013 Microchip Technology Inc. DS80000470H-page 13
PIC24FJ64GA004 FAMILY
30. Module: UART (FIFO Error Flags)
Under certain circumstances, the PERR and
FERR error bits may not be correct for all bytes in
the receive FIFO. This has only been observed
when both of the following conditions are met:
• the UARTx receive interrupt is set to occur when
the FIFO is full or 3/4 full (UxSTA<7:6> = 1x),
and
• more than 2 bytes with an error are received.
In these cases, only the first two bytes, with a
parity or framing error, will have the corresponding
bits indicate correctly. The error bits will not be set
after this.
Work around
None.
Affected Silicon Revisions
31. Module: Core (BOR)
When the on-chip regulator is enabled (DISVREG
tied to V
SS), a BOR event may spontaneously
occur under the following circumstances:
•V
DD is less than 2.5V, and
• the internal band gap reference is being used as
a reference with the A/D Converter
(AD1PCFG<15> = 0)
Work around
Do not select the internal band gap as a reference
for the A/D Converter when the on-chip regulator
is in Tracking mode (LVDIF (IFS4<8>) = 1).
Affected Silicon Revisions
32. Module: Core (Instruction Set)
If an instruction producing a read-after-write stall
condition is executed inside a REPEAT loop, the
instruction will be executed fewer times than was
intended. For example, this loop:
repeat #0xf
inc [w1],[++w1]
will execute less than 16 times.
Work around
Avoid using REPEAT to repetitively execute
instructions that create a stall condition. Instead,
use a software loop using conditional branches.
The MPLAB
®
C Compiler will not generate
REPEAT loops that cause this erratum.
Affected Silicon Revisions
33. Module: Memory (Program Space
Visibility)
When accessing data in the PSV area of data
RAM, it is possible to generate a false address
error trap condition by reading data located
precisely at the lower address boundary (8000h).
If data is read using an instruction with an auto-
decrement, the resulting RAM address will be
below the PSV boundary (i.e., at 7FFEh); this will
result in an address error trap.
This false address error can also occur if a 32-bit
MOV instruction is used to read the data at location,
8000h.
Work around
Do not use the first location of a PSV page
(address 8000h).
The MPLAB C Compiler (v3.11 or later) supports
the option, -merrata=psv_trap, to prevent it
from generating code that would cause this
erratum.
Affected Silicon Revisions
A3/
A4
B4 B5
B8
XXX
X
A3/
A4
B4 B5
B8
XXX
X
A3/
A4
B4 B5
B8
X
A3/
A4
B4 B5
B8
XXX