UM0239 datasheet(21/44 Pages) STMICROELECTRONICS

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UM0239

Getting started

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4.2.19

Limitations on Control Register parameters

Certain parameters are limited during programming because either their functions are not

supported by the tool (software limitations) or because they depend on other Control

4.3

Selecting the Dual Channel option

Certain ST7540 PLM Demo Boards(a) have the ability to select the central frequency of

external coupling filter between two operating frequencies.

In order to activate this function, the user must select the DUAL CH. check box in the Dual

Channel selection pane, set the correct frequencies for each of the two channels. When

Dual Channel function is enabled, a command of channel selection is transmitted each time

the user pushes the Write Control Register button.

When the Dual Channel feature is enabled, the Control Register is programmed according

to the selected Dual Channel frequency.

Table 21.

Frame length

Bits [47:40]

Value

MSB--LSB

From 0x00 to 0xFF

Default

0x80

Table 22.

Limitations on control register parameters

Parameter

Limitation

Interface mode

SW limitation: Only Synchronous Mains interface mode is supported by SW

tool

Output Voltage Freeze HW limitation: Available only if Extended Control Register Bit is enabled

Header Recognition

HW limitation: Available only if Extended Control Register Bit is enabled

Frame Length Count HW limitation: Available only if Extended Control Register Bit is enabled

Header Length

HW limitation: Available only if Extended Control Register Bit is enabled

Frame Header

HW limitation: Available only if Extended Control Register Bit is enabled

Frame Length

HW limitation: Available only if Extended Control Register Bit is enabled

PLM Eval Boards that support the Dual Channel feature have the suffix "DUAL" (i.e. "EVALST7540DUAL Rev.

x.x")

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