STGAP1ASTR datasheet(49/70 Pages) STMICROELECTRONICS

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STGAP1AS

Programming manual

At the end of the device setup the StopConfig command has to be sent in order to quit the

configuration mode and make all changes effective.

Configuration sequence must be repeated every time the power supply on either side (VDD

or VH) is removed and then restored.



VDD falling below critical value will result in the REGERRL flag being set in status

registers after that the proper VDD level is restored.



VH falling below critical value will result in the REGERRR flag being set in status

registers.

After that all supply voltages are supplied and stable, the configuration process can be

executed. The flow chart shown in Figure 24 is recommended for the configuration. In this

way it will be possible to check that the desired configuration has been correctly stored in

the device at the end of the configuration sequence.

Figure 24. STGAP1AS recommended configuration flow

9.1.2

WriteReg command

Table 16. WriteReg command synopsis

Byte

234

To device

100A AAAA(1)

CCCC CCCC(2)

DDDD DDDD(3)

KKKK KKKK(4)

1. The command byte where AAAAA is the address of the target register.

2. The CRC byte of the command, if the CRC check is disabled this byte is ignored.

3. Data to be written into the target register.

4. The CRC byte of the command and data, if the CRC check is disabled this byte is ignored.

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