Datasheet

PIC24HJXXXGPX06/X08/X10

40. Module: DMA

When the DMA channel is configured for One Shot

mode with NULL write enabled, the channel will

write an extra NULL to the peripheral register after

completing the last transfer. In the case of the SPI

module and the SPIxBUF register, this would

cause the SPI module to perform an extra receive

operation.

Work around

None. In the case of using DMA NULL write with

the SPI module, perform a dummy read of the

SPIxBUF register after the DMA transfer is

completed to clear the SPIRBF flag and prevent an

un-expected overflow condition on the next SPI

receive operation.

41. Module: REPEAT Instruction

Any instruction executed inside a REPEAT loop,

which produces a Read-After-Write stall condition,

results in the instruction being executed fewer

times than was intended.

An example of such code is:

repeat #0xf

inc [w1],[++w1]

Work around

Avoid repeating an instruction that creates a stall

using a REPEAT instruction. Instead, use a

software loop using conditional branches.