Rainbow Electronics MAX7057 User Manual
Page 11
Depending on the command, byte 1 through byte N
may assume different functions. They may either be a
direct command (write, read, read all, reset), or an
address or data contents. The commands available in
the MAX7057 SPI are described in detail below:
Write: The write command (0x01) is used to program
the MAX7057 registers (see Tables 2 and 3). The for-
mat shown in Figure 3 must be followed, allowing all the
registers to be programmed within one CS cycle.
Using a byte descriptive notation, the write command
can be viewed as the following sequence:
Data 0 is then written to the register addressed by
<Initial Address>, Data 1 is written to <Initial Address +
1>, and so on.
Read: To execute an SPI read operation, the general-
purpose output (GPO) pin must be configured to either
a CKOUT_SDO or SDO function (see Tables 15 and 16
for details).
SDI: <0x01> <Initial Address> <Data 0> <Data 1> … <Data N>
MAX7057
300MHz to 450MHz Frequency-Programmable
ASK/FSK Transmitter
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11
Figure 2. SPI Format
SDI
SCLK
CS
WRITE COMMAND (0x01)
INITIAL ADDRESS (A[7:0])
DATA 0
DATA N
D7
D7
D6
D5
D4
D3
D2
D1
D0
A7
A6
A5
A4
A3
A2
A1
A0
D0
SDI
DATA 1
DATA N
SCLK
D7
D6
D5
D4
D3
D2
D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
CS
Figure 3. SPI Write Command Format