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STPM32 Datasheet(PDF) 73 Page - STMicroelectronics

Part # STPM32
Description  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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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPM32 Datasheet(HTML) 73 Page - STMicroelectronics

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DS10272 Rev 8
73/121
STPM32, STPM33, STPM34
Theory of operation
121
Figure 52. UART frame
As shown in Figure 52, each frame consists of 10 bits. Each bit is sent to a variable rate. All
frame data are sent LSBfirst.
If a BREAK frame is received, a break flag is set and the whole packet reception aborts.
The frame receiver can recognize an IDLE frame, but packet processing is not involved.
UART control register
US_REG1 and US_REG2 registers respectively contain all the configuration parameters of
SPI and UART interfaces of the STPM3x. Table 30 describes UART bits:
Timeout: any communication session should be completed within this configurable time
threshold (ms). If the timeout value is zero this threshold is disabled. If timeout expires,
the reception and the transmission processes stop and, if enabled, a BREAK character
is transmitted to warn the master about the error. Packet processing can resume only
after that BREAK transmission has been completed and an IDLE frame has been
received.
Break on error: if an error occurs (framing/noise/timeout/RX overrun) a BREAK
command is transmitted to the master.
Noise error detection. An oversampling technique is implemented to raise the noise
level immunity: received bit value is accomplished taking in account the value of three
Table 30. UART control register US_REG1
Row bit position
Name
Description
Default value
[23:16]
Timeout
Timeout threshold [ms]
0
9
Break on error
Enable/disable the operation to send break
frame in case of error
0
8
Noise detection
enable
Enable/disable error detection based on
noise immunity algorithm
0
[7:0]
CRCPolynomial
Polynomial used to validate transmitted and
received data
0x07



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