3.5.2.7.2 FSCR – Frequency Synthesizer Control Register
Note: Setting FSCR to 0x00 switches off the power amplifier.
| Name: | FSCR |
| Offset: | 0x00B |
| Reset: | 0x00 |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| PAON | PAOER | TXMS[1:0] | SFM | TXMOD | |||||
| Access | R | R | R | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
Bit 7 – PAON Power Amplifier Output is On
Bit 6 – Reserved Bit
0’ when read.Bit 5 – Reserved Bit
0’ when read.Bit 4 – PAOER Power Amplifier Output Enable Register
1’.Bits 3:2 – TXMS[1:0] TX Modulation Source
| TXMS1 | TXMS0 | Description |
|---|---|---|
0 | 0 | FSCR.TXMOD register |
0 | 1 | TMDI input pin 18 – transparent mode input |
1 | x | TX modulator shift register serial output (SO4TX) |
Bit 1 – SFM Select FSK Modulation
| SFM | Description |
|---|---|
0 | ASK modulation is used. The carrier frequency is selected by the FFREQ1H/M/L bytes. |
1 | FSK modulation is used. The power amplifier is constantly on.
The carrier frequency depends on the modulation signal:
‘0’ corresponds to the FFREQ1H/M/L setting;
‘1’ corresponds to the FFREQ2H/M/L
setting. |
Bit 0 – TXMOD Transmit Modulation
| SFM | TXMOD | Description |
|---|---|---|
0 | 0 | ASK: Carrier is off. |
0 | 1 | ASK: Carrier is on. Use carrier frequency 1 as defined in (FFREQ1H/M/L). |
1 | 0 | FSK: Use carrier frequency 1 as defined in (FFREQ1H/M/L). |
1 | 1 | FSK: Use carrier frequency 2 as defined in (FFREQ2H/M/L). |