ST72361AR4-Auto datasheet(163/279 Pages) STMICROELECTRONICS

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ST72361xx-Auto

LINSCI serial communication interface (LIN master/slave)

Doc ID 12468 Rev 3

163/279

with:

PR = 1, 3, 4 or 13 (see SCP[1:0] bits)

TR = 1, 2, 4, 8, 16, 32, 64,128

(see SCT[2:0] bits)

RR = 1, 2, 4, 8, 16, 32, 64,128

(see SCR[2:0] bits)

All these bits are in the SCIBRR register.

Example 1: If fCPU is 8 MHz (normal mode) and if PR = 13 and TR = RR = 1, the transmit

and receive baud rates are 38400 baud.

Note:

The baud rate registers MUST NOT be changed while the transmitter or the receiver is

enabled.

15.5.6

Extended baud rate generation

The extended prescaler option gives a very fine tuning on the baud rate, using a 255 value

prescaler, whereas the conventional baud rate generator retains industry standard software

compatibility.

The extended baud rate generator block diagram is described in Figure 79.

The output clock rate sent to the transmitter or to the receiver will be the output from the 16

divider divided by a factor ranging from 1 to 255 set in the SCIERPR or the SCIETPR

Note:

The extended prescaler is activated by setting the SCIETPR or SCIERPR register to a value

other than zero. The baud rates are calculated as follows:

with:

ETPR = 1...255 (see SCIETPR register)

ERPR = 1...255 (see SCIERPR register)

Tx =

16*ETPR*(PR*TR)

fCPU

Rx =

16*ERPR*(PR*RR)

fCPU

ST72361AR4-Auto Datasheet(PDF) 163 Page - STMicroelectronics