RFM70 V1.0
register is used to select the IRQ sources that
are allowed to assert the IRQ pin. By setting
one of the MASK bits high, the corresponding
IRQ source is disabled. By default all IRQ
sources are enabled.
to low transition on CSN.
In parallel to the SPI command word applied
on the MOSI pin, the STATUS register is
shifted serially out on the MISO pin.
The 3 bit pipe information in the STATUS
register is updated during the IRQ pin high to
low transition. If the STATUS register is read
during an IRQ pin high to low transition, the
pipe information is unreliable.
The serial shifting SPI commands is in the
following format:
<Command word: MSB bit to LSB bit
(one byte)>
<Data bytes: LSB byte to MSB byte,
MSB bit in each byte first> for all
registers at bank 0 and register 9 to
register 14 at bank 1
6.3 SPI Interface
<Data bytes: MSB byte to LSB byte,
MSB bit in each byte first> for register 0
to register 8 at bank 1
6.3.1 SPI Command
The SPI commands are shown in Table 2.
Every new command must be started by a high
Command
# Data
Command name
word
Operation
bytes
(binary)
Read command and status registers. AAAAA =
5 bit Register Map Address
1 to 5
LSB byte first
R_REGISTER
W_REGISTER
000A AAAA
001A AAAA
Write command and status registers. AAAAA = 5
bit Register Map Address
Executable in power down or standby modes only.
1 to 5
LSB byte first
Read RX-payload: 1 – 32 bytes. A read operation
always starts at byte 0. Payload is deleted from FIFO
after it is read. Used in RX mode.
1 to 32
LSB byte first
R_RX_PAYLOAD
0110 0001
Write TX-payload: 1 – 32 bytes. A write operation
1 to 32
LSB byte first
W_TX_PAYLOAD
FLUSH_TX
1010 0000
1110 0001
always starts at byte 0 used in TX payload.
Flush TX FIFO, used in TX mode
0
Flush RX FIFO, used in RX mode
Should not be executed during transmission of
acknowledge, that is, acknowledge package will not
be completed.
FLUSH_RX
1110 0010
0
Used for a PTX device
Reuse last transmitted payload. Packets are repeatedly
retransmitted as long as CE is high.
TX payload reuse is active until
REUSE_TX_PL
1110 0011
0
W_TX_PAYLOAD or FLUSH TX is executed. TX
payload reuse must not be activated or deactivated
during package transmission
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