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
, Data 1 is written to 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> …

MAX7057

300MHz to 450MHz Frequency-Programmable

ASK/FSK Transmitter

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Figure 2. SPI Format

SDI

SCLK

WRITE COMMAND (0x01)

INITIAL ADDRESS (A[7:0])

DATA 0

DATA N

SDI

DATA 1

DATA N

SCLK

Figure 3. SPI Write Command Format