3.5.2.7.1 FSEN – Frequency Synthesizer Enable Register
| Name: | FSEN |
| Offset: | 0x060 |
| Reset: | 0x00 |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| ANTT | ASEN | PEEN | GAEN | SDEN | SDPU | ||||
| Access | R | R | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Bit 7 – Reserved Bit
0’ when read.Bit 6 – Reserved Bit
0’ when read.Bit 5 – ANTT Antenna Tuning Active
| ANTT | Description |
|---|---|
0 | Normal operating mode |
1 | During antenna tuning operation the power amplifier has to be
switched on. If ANTT = 1, the PA is permanently
forced to be ON regardless of any other baseband settings such
as modulation type, modulation source or FSCR.PAOER. The biasing
of the PA still has to be set separately in the front-end
registers. |
Bit 4 – ASEN ASK Shaping Enable
| ASEN | Description |
|---|---|
0 | ASK shaping is disabled. |
1 | ASK shaping is enabled. The power amplifier is ramped to
its configured output power in seven steps. The step length
can be set in FSFCR.ASDIV. In FSK mode (FSCR.SFM =
1), the initial power-up and final
power-down of the PA via FSCR.PAOER is also shaped. |
Bit 3 – PEEN Preemphasis Filtering Enable
0). Modifying the settings during operation may lead to
unstable operation.| PEEN | Description |
|---|---|
0 | Preemphasis filter is disabled. |
1 | Preemphasis filter is activated. |
Bit 2 – GAEN Gauss Filtering Enable
0). Modifying the settings during operation may lead to
unstable operation.| GAEN | Description |
|---|---|
0 | Gauss filtering is disabled. |
1 | Gauss filtering is activated. |
Bit 1 – SDEN Sigma-Delta Modulator Enable for Receive and Transmit Frequency Synthesis
| SDEN | Description |
|---|---|
0 | Sigma-delta modulator is disabled. |
1 | Sigma-delta modulator is activated. |
Bit 0 – SDPU Sigma-Delta Power-Up
| SDPU | Description |
|---|---|
0 | Sigma-delta modulator power supply is switched off. |
1 | Enables the power supply for sigma-delta modulator. |