ST7MC1K2-Auto datasheet(169/371 Pages) STMICROELECTRONICS

169 / 371 page

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On-chip peripherals

169/371

Error due to baud rate quantization

The baud rate can be adjusted in steps of 1/(16 * LDIV). The worst case occurs when the

‘real’ baud rate is in the middle of a step.

This leads to a quantization error (DQUANT) equal to 1/(2*16*LDIVMIN).

Impact of clock deviation on maximum baud rate

The choice of the nominal baud rate (LDIVNOM) influences both the quantization error

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

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 + 2/(128*LDIVMIN) + 1/(2*16*LDIVMIN) + DREC + DTCL <3.75%

Example:

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

LDIVMIN = 25 - 0.15*25 = 21.25

DMEAS = 2/(128*LDIVMIN) * 100 = 0.00073%

DQUANT =1/(2*16*LDIVMIN) * 100 = 0.0015%

LIN slave systems

For LIN slave systems (the LINE and LSLV bits are set), receivers wake up by LIN synch

break or LIN identifier detection (depending on the LHDM bit).

Hot plugging feature for LIN slave nodes

In LIN slave mute mode (the LINE, LSLV and RWU bits are set) it is possible to hot plug to a

network during an ongoing communication flow. In this case the SCI monitors the bus on the

RDI line until 11 consecutive dominant bits have been detected and discards all the other

bits received.

10.5.10

LIN mode registers

SCI status register (SCISR)

SCISR

Reset value: 1100 0000 (C0h)

654

TDRE

RDRF

IDLE

LHE

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