UM0239 datasheet(20/44 Pages) STMICROELECTRONICS

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Getting started

UM0239

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4.2.15

Sensitivity mode

The Sensitivity Mode parameter (Bit 22) defines the low threshold for the FSK demodulator

block.

4.2.16

Pre-filter

The Pre-filter parameter (Bit 23) enables a pre-filter on the Reception path.

4.2.17

Frame header

The Frame Header (Bits [39:24]) defines the Header to recognize when the Header

Recognition function is enabled. It can consist of one 16-bit header or by two 8-bit headers

depending on the Header Length value (Bit 20).

This function is available only if the Extended Control Register parameter (Bit 21) is

enabled.

4.2.18

Frame length

This parameter (Bits [47:40]) defines the number of data, expressed in 16-bit words (e.g.

Frame Length equal to "1"

→16 bits), to send to the Host Controller on the RxD line when

the Header Recognition and Frame Length Count parameters are enabled and a Header

has been detected.

This function is available only if the Extended Control Register parameter (Bit 21) is

enabled.

Table 17.

Extended control register

Bit 21

Value

Disabled (default)

1Enabled

Table 18.

Sensitivity mode

Bit 22

Value

Normal Sensitivity (500 µVrms) (default)

High Sensitivity (250 µVrms)

Table 19.

Pre-filter

Bit 23

Value

Disabled (default)

1Enabled

Table 20.

Pre-filter

Bits [39:24]

Value

MSB--LSB

From 0x0000 to 0xFFFF

Default

0x9B58

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