AN332
Rev. 0.8
19
Command 0x30. TX
_
TUNE
_
FREQ
Sets the state of the RF carrier and sets the tuning frequency between 76 and 108 MHz in 10 kHz units and steps
of 50 kHz. For example 76.05 MHz = 7605 is valid because it follows the 50 kHz step requirement but
76.01 MHz = 7601 is not valid. The CTS bit (and optional interrupt) is set when it is safe to send the next
command. The ERR bit (and optional interrupt) is set if an invalid argument is sent. Note that only a single interrupt
occurs if both the CTS and ERR bits are set. The optional STC interrupt is set when the command completes. The
STCINT bit is set only after the GET_INT_STATUS command is called. This command may only be sent when in
powerup mode. The command clears the STC bit if it is already set. See Figure 29, “CTS and STC Timing Model,”
on page 244 and Table 48, “Command Timing Parameters for the FM Transmitter,” on page 245.
Available in: All
Command arguments: Three
Response bytes: None
Command
Response
Bit
D7
D6
D5
D4
D3
D2
D1
D0
CMD
0
0
1
1
0
0
0
0
ARG1
0
0
0
0
0
0
0
0
ARG2
FREQ
H
[7:0]
ARG3
FREQ
L
[7:0]
ARG
Bit
Name
Function
1
7:0
Reserved
Always write to 0.
2
7:0
FREQ
H
[7:0]
Tune Frequency High Byte.
This byte in combination with FREQ
L
selects the tune frequency in units of
10 kHz. The valid range is from 7600 to 10800 (76–108 MHz). The frequency
must be a multiple of 50 kHz.
3
7:0
FREQ
L
[7:0]
Tune Frequency Low Byte.
This byte in combination with FREQ
H
selects the tune frequency in units of
10 kHz. The valid range is from 7600 to 10800 (76–108 MHz). The frequency
must be a multiple of 50 kHz.
Bit
D7
D6
D5
D4
D3
D2
D1
D0
STATUS
CTS
ERR
X
X
X
RDSINT
ASQINT
STCINT
