Rainbow Electronics RF22 - Manual (Page 54)

RF22
Version: 0.1 Date: 12/23/2008
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Register 03h. Interrupt/Status 1
Bit D7 D6 D5 D4 D3 D2 D1 D0
Name ifferr itxffafull itxffaem irxffafull iext ipksent ipkvalid icrcerror
Type R R R R R R R R
Reset value = xxxxxxxx
Bit Name Function
7
ifferr
FIFO Underflow/Overflow Error.
When set to 1 the TX or RX FIFO has overflowed or underflowed.
6 itxffafull TX FIFO Almost Full.
When set to 1 the TX FIFO has met its almost full threshold and needs to be transmitted.
5 itxffaem TX FIFO Almost Empty.
When set to 1 the TX FIFO is almost empty and needs to be filled.
4 irxffafull RX FIFO Almost Full.
When set to 1 the RX FIFO has met its almost full threshold and needs to be read by the
microcontroller.
3
iext
External Interrupt.
When set to 1 an interrupt occurred on one of the GPIO’s if it is programmed so. The status can
be checked in register 0Eh. See GPIOx Configuration section for the details.
2 ipksent Packet Sent Interrupt.
When set to1 a valid packet has been transmitted.
1 ipkvalid Valid Packet Received.
When set to 1 a valid packet has been received.
0 icrcerror CRC Error.
When set to 1 the cyclic redundancy check is failed.
When any of the Interrupt/Status 1 bits change state from 0 to 1 the device will notify the microcontroller by setting the
nIRQ pin LOW if it is enabled in the Interrupt Enable 1 register. The nIRQ pin will go to HIGH and all the enabled
interrupt bits will be cleared when the microcontroller reads this address. If any of these bits is not enabled in the
Interrupt Enable 1 register then it becomes a status signal that can be read anytime in the same location and will not be
cleared by reading the register.
Table 33. Interrupt or Status 1 Bit Set/Clear Description
Bit Status Name Set/Clear Conditions
7 ifferr Set if there is a TX or RX FIFO overflow or underflow. Cleared by applying FIFO reset.
6 itxffafull Set when the number of bytes written to TX FIFO is greater than the Almost Full threshold.
Automatically cleared at the start of transmission when the number of bytes in the FIFO is less
than or equal to the threshold.
5 itxffaem Set when the number of bytes in the TX FIFO is less than or equal to the Almost Empty
threshold. Automatically cleared when the number of data bytes in the TX FIFO is above the
Almost Empty threshold.
4 irxffafull Set when the number of bytes in the RX FIFO is greater than the Almost Full threshold. Cleared
when the number of bytes in the RX FIFO is below the Almost Full threshold.
3 iext External interrupt source.
2 ipksent Set once a packet is successfully sent (no TX abort). Cleared upon leaving FIFO mode or at the
start of a new transmission.
1 ipkvalid Set up the successful reception of a packet (no RX abort). Cleared upon receiving and
acknowledging the Sync Word for the next packet.
0 icrcerror Set if the CRC computed from the RX packet differs from the CRC in the TX packet. Cleared at
the start of reception for the next packet.