4.4.3.2.1.2 RXFOB – Received Frequency Offset versus Intermediate Frequency on Path B (FSK Only)

Name: RXFOB
Offset: 0x09F
Reset: 0x00

The RXFOB register provides the frequency difference between the selected receive frequency and the currently received signal on path B. This register is updated continuously if the RX path B is working. It is held in the reset state if path B is disabled (RDPR.PRFLT = 1 or RDPR.PRPTB = 1) or the complete RX DSP is turned off (RDCR.RDEN = 0).

Bit 76543210 
 RXFOB[7:0] 
Access RRRRRRRR 
Reset 00000000 

Bits 7:0 – RXFOB[7:0] Received Frequency Offset

The values are two’s complement-signed integers. The carrier frequency offset versus intermediate frequency can be calculated as:
f _ o f f s e t _ B = t w o s _ c o m p l e m e n t 2 d e c ( R X F O B ) × C L K _ B B 256 (17)