STM8S datasheet(360/467 Pages) STMICROELECTRONICS

Part #	STM8S

Description	STM8S Series and STM8AF Series 8-bit microcontrollers

PDF	467 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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360 / 467 page

Universal asynchronous receiver transmitter (UART)

RM0016

360/467

DocID14587 Rev 14

Impact of clock deviation on maximum baud rate

The choice of the nominal baud rate (UARTDIVNOM) will influence both the quantization

error (DQUANT) and the measurement error (DMEAS). The worst case occurs for

UARTDIVMIN.

Consequently, at a given CPU frequency, the maximum possible nominal baud rate

(LPRMIN) should be chosen with respect to the maximum tolerated deviation given by the

equation:

DTRA + 1 / (2*UARTDIVMIN) + DREC + DTCL < 3.75%

Example:

A nominal baud rate of 20 Kbits/s at TCPU = 125 ns (8 MHz) leads to UARTDIVNOM = 25d.

UARTDIVMIN = 25 - 0.15*25 = 21.25

DQUANT = 1 / (2*UARTDIVMIN) = 0.0015%

Figure 138. Bit sampling in reception mode

22.4.4

LIN mode selection

Table 58. LIN mode selection

LINE

LSLV LASE

Meaning

LIN mode disabled

LIN Master Mode

LIN Slave Mode

with Automatic resynchronization disabled

LIN Slave Mode

with Automatic resynchronization enabled

STM8S Datasheet(PDF) 360 Page - STMicroelectronics