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Transceiver Digital Control and Communications
MKW01xxRM Reference Manual, Rev. 3, 04/2016
7-4
Freescale Semiconductor, Inc.
7.2.2.2
Size
The FIFO size is fixed to 66 bytes.
7.2.2.3
Interrupt Sources and Flags
•
FifoNotEmpty
:
FifoNotEmpty
interrupt source is low when byte 0, i.e. whole FIFO, is empty.
Otherwise it is high. Note that when retrieving data from the FIFO,
FifoNotEmpty
is updated on
NSS falling edge, i.e. when
FifoNotEmpty
is updated to low state the currently started read
operation must be completed. In other words,
FifoNotEmpty
state must be checked after each read
operation for a decision on the next one (
FifoNotEmpty
= 1: more byte(s) to read;
FifoNotEmpty
=
0: no more byte to read).
•
FifoFull
:
FifoFull
interrupt source is high when the last FIFO byte, i.e. the whole FIFO, is full.
Otherwise it is low.
•
FifoOverrunFlag
:
FifoOverrunFlag
is set when a new byte is written by the user (in TX or Standby
modes) or the SR (in RX mode) while the FIFO is already full. Data is lost and the flag should be
cleared by writing a 1, note that the FIFO will also be cleared.
•
PacketSent
:
PacketSent
interrupt source goes high when the SR's last bit has been sent.
•
FifoLevel
: Threshold can be programmed by
FifoThreshold
in
RegFifoThresh
. Its behavior is
illustrated in figure below.
Figure 7-4. FifoLevel IRQ Source Behavior
NOTE
FifoLevel interrupt is updated only after a read or write operation on the
FIFO. Thus the interrupt cannot be dynamically updated by only changing
the FifoThreshold parameter.
FifoLevel interrupt is valid as long as FifoFull does not occur. An empty
FIFO will restore its normal operation
Содержание MKW01Z128
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