UM0239 datasheet(14/44 Pages) STMICROELECTRONICS

14 / 44 page

Getting started

UM0239

14/44

Figure 5.

Device selection and communication error during COM selection

Communication errors can occur at any time. The Device Selection message box appears if

an error occurs only during the first COM selection. To ensure reliable communications, a

link status LED is present on the Status Bar as shown in Figure 3.

Note:

If an incorrect device is selected, the user must close and restart the Program in order to

avoid undesired behavior.

4.2

Setting the Control Register parameters

To access to the ST7540 Control Register, click the REG button on the Toolbar. The main

window then displays the Control Register dialog box as shown in Figure 6.

Figure 6.

Control Register window

This dialog box enables the user to modify the Control Register parameters.

Certain parameters may only be modified

by enabling the Extended Control Register bit of

the Control Register. For more information about the Extended Control Register bit, see

Section 4.2.14: Extended control register on page 19.

COMMUNICATION ERROR

DEVICE SELECTION

ST7540 CONTROL REGISTER WINDOW

1. Control Register Params

Panel

2. WR Control Register String

3. Events Panel

4. Write CR Button

5. Read CR Button

6. Dual channel selection

UM0239 Datasheet(PDF) 14 Page - STMicroelectronics