TRC101 查看數據表（PDF） - RF Monolithics, Inc

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TRC101

300-1000 MHz RF Transceiver

RF Monolithics, Inc 

Automatic Frequency Adjust Register [POR=C4F7h]

Bit Bit Bit Bit Bit Bit Bit Bit Bit

Bit

Bit

Bit

Bit

Bit

Bit

Bit

15 14 13 12 11 10 9 8

7

6

5

4

3

2

1

0

1 1 0 0 0 1 0 0 AUTO1 AUTO0 RNG1 RNG0 STRB ACCF OFFEN AFEN

The AFA (Automatic Frequency Adjust) Register configures:

• Manual or Automatic frequency offset adjustment

• Calculation of the offset value and write to the Status Register

• Fine offset adjustment control

The AFA (Automatic Frequency Adjust) Register controls and configures the frequency adjustment range

and mode for keeping the transmitter and receiver frequency locked, providing for an optimal link. The

AFA may be manually controlled by an external processor by asserting a strobe signal to initiate a

sample, or may be setup for automatic operation. The AFA also calculates the offset of the transmit and

receive frequency. This offset value is included in the status register read and the AFA must be disabled

during the status read to ensure reporting good offset accuracy.

Bit [15..8] - Command Code: These bits are the command code that is sent serially to the processor that

identifies the bits to be written to the Automatic Frequency Adjust Register.

Bit [7..6] – Mode Selection: These bits select Automatic or Manual operation. When set to Manual

operation, the TRC101 will take a sample when a strobe signal (See Bit [3]) is written to the register.

There are four modes of operation. See Table 5 below for configuration.

TABLE 5.

Automatic fOFFSET

Mode

Mode Off

Run Once after Pwr-up

Keep offset during Rcv

ONLY

Keep offset indep of

VDI state

AUTO1

0

0

1

1

AUTO0

0

1

0

1

Mode(0,1) – The circuit takes a measurement only once after power-up.

Mode(1,0) – When the Valid Data Detector (VDI) pin is low, indicating poor receiving conditions,

the offset register is automatically cleared. Use this setting when receiving from several different

transmitters that are operating very close to the same frequencies so that the receiver may align

itself on each transmission from a different transmitter.

Mode(1,1) – This setting is best used when receiving from a single transmitter. The measured

offset value is kept independent of the state of the VDI signal. Once the link is aligned it may be

manually toggled by the user.

14

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