SPMCK16Z4MPV20 datasheet(415/500 Pages) FREESCALE

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M68HC16 Z SERIES

USER’S MANUAL

D-41

Writing a value of zero to SCBR disables the baud rate generator. There are 8191 dif-

ferent bauds available. The baud value depends on the value for SCBR and the sys-

tem clock, as used in the equation above. Table D-32 shows possible baud rates for

a 16.78 MHz system clock. The maximum baud rate with this system clock speed is

524 kbaud.

More accurate baud rates can be obtained by varying the system clock frequency with

the VCO synthesizer. Each VCO speed increment adjusts the baud rate up or down

by 1/64 or 1.56%.

D.6.5 SCI Control Register 1

SCCR1 contains SCI configuration parameters, including transmitter and receiver en-

able bits, interrupt enable bits, and operating mode enable bits. SCCR0 can be read

or written at any time. The SCI can modify the RWU bit under certain circumstances.

Changing the value of SCCR1 bits during a transfer operation disrupts operation.

Bit 15 — Not Implemented

LOOPS — Loop Mode

0 = Normal SCI operation, no looping, feedback path disabled.

1 = Test SCI operation, looping, feedback path enabled.

WOMS — Wired-OR Mode for SCI Pins

0 = If configured as an output, TXD is a normal CMOS output.

1 = If configured as an output, TXD is an open-drain output.

Table D-32 Examples of SCI Baud Rates

Nominal

Baud Rate

Actual

Baud Rate

Percent Error

Value of SCBR

500,00.00

524,288.00

4.86

38,400.00

37,449.14

–2.48

32,768.00

0.00

19,200.00

19,418.07

1.14

9,600.00

9,532.51

–0.70

4,800.00

4,809.98

0.21

109

2,400.00

2,404.99

0.21

218

1,200.00

1,199.74

–0.02

437

600.00

599.87

–0.02

874

300.00

299.94

–0.02

1,748

110.00

110.01

0.01

4,766

64.00

0.01

8,191

SCCR1 — SCI Control Register 1

$YFFC0A

NOT USED

LOOPS

WOMS

ILT

WAKE

TIE

TCIE

RIE

ILIE

RWU

SBK

RESET:

Freescale Semiconductor, Inc.

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