UM0239 datasheet(23/44 Pages) STMICROELECTRONICS

23 / 44 page

UM0239

Getting started

23/44

If a communication problem occurs, a message box describing the issue appears. In this

case, the user must try again to perform the same operation that caused the problem until

no more message boxes appear and the Link Monitor LED becomes green.

Note:

If communication problems persist, the user can reset the microcontroller on

EVALCOMMBOARD by pushing the RES button. After this operation, a Control Register

Writing or a Control Register Reading must be performed in order to avoid undesired

behavior.

4.5

Using the Control Register String

The selected parameter values of the virtual ST7540 Control Register appear in the textbox

at the bottom of the Control Register dialog box (Figure 10) in binary format from MSB to

LSB. When the user modifies or clicks one of the Control Register parameters, the

corresponding bits of the Control Register string become red.

If the Extended Register control bit is set to Enabled, the second part of the Control Register

string (Bits 47 to 24) becomes active and the extended functions are available.

Figure 10.

Write control register string and parameters position

Note:

When the Extended Register control bit (bit 21) is set to Enabled, the ST7540 accepts 24- or

48-bit CR strings. The “ST7538/40 FSK Power Line Modem Demo Kit” always writes 48 bits

when this bit is enabled.

CONTROL REGISTER STRING

Carrier

Frequency (0-2)

Baud Rate

(3-4)

Deviation (5)

Watchdog (6)

Tx Time Out

(0-2)

Not Used (11)

Mains interface

(14)

Output Voltage

Freeze (17)

Det. Method

(12-13)

Output clock

(15-16)

Header

length

(20)

Header Rec.

(18)

Frame Count

(19)

Extended

Reg. (21)

Sensitivity

(22)

Pre filter

(23)

Header Length

(40-47)

Frame Header

(24-39)

Det. Time

(9-10)

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