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STPM32 Datasheet(PDF) 71 Page - STMicroelectronics

No. de pieza STPM32
Descripción Electrónicos  ASSP for metering applications with up to four independent 24-bit 2nd order sigma-delta ADCs, 4 MHz OSF and 2 embedded PGLNA
PDF  121 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPM32 Datasheet(HTML) 71 Page - STMicroelectronics

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DS10272 Rev 8
71/121
STPM32, STPM33, STPM34
Theory of operation
121
To receive data from register 04 the master should send the frame:
FF_FF_FF_FF
To write lower (least significant) 16-bits in row 3 with data #AABB and read back from the
same row:
06_06_BB_AA
And then
FF_FF_FF_FF
To receive
The sent frame changes according to LSBfirst setting:
MISO line is valid as well. In this case, there is a full-reverse data transmission when
LSBfirst=1, since data bit reception order changes as shown in Table 27.
LSBfirst can be programmed using the transactions (other configuration bits involved in the
transaction are set to their default states):
The transaction to write LSBfirst = 0 is byte-reversed, since the system has moved from the
LSBfirst = 1 condition. The read address is set so to read in the following transaction the
content of US_REG1.
Table 26. LSBfirst example
LSBfirst = 0
04_03_CD_AB
LSBfirst = 1
20_C0_B3_D5
Table 27. LSBfirst and MISO line
Byte[0]
Byte[1]
Byte[2]
Byte[3]
LSBfirst = 0
[7:0]
[15:8]
[23:16]
[31:24]
LSBfirst = 1
[0:7]
[8:15]
[16:23]
[24:31]
Table 28. LSBfirst programming
LSBfirst = 1
24_24_07_CO
LSBfirst = 0
24_24_EO_02



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