STPM01 datasheet(41/60 Pages) STMICROELECTRONICS

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STPM01

Theory of operation

Doc ID 10853 Rev 8

41/60

division makes sense with the MSB of data value because the MSN of it holds the parity

code rather than useful data.

The sequence of data record during the reading operation is fixed. Normally, an application

will read 1st,.., 6th data record, the 7th and 8th data record would read only when it need to

fetch the configuration data. However, an application may apply a precharge command (see

Table 17) prior reading phase. This command forces the device to respond with the

sequence 5th,.., 8th, 1st,.., 4th. Such change of sequence can be used to skip the first four

data records.

The timing diagram of the reading operation is shown on the Figure 26. One can see the

latching and beginning of shifting phase of the first byte (0x5F) of the first data record and

end of reading. Also, both alternatives to reset the internal transmission serial clock counter

is shown in signal SYN.

Figure 25.

Data records reconstruction

Figure 26.

Timing for data records reading

3t4

SCLNLC

SDATD

SYN

SCS

1st byte

last bit of 32nd byte

f(read)

SCLNLC

SDATD

SYN

SCS

1st byte

last bit of 32nd byte

f(read)

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