MC68HC16Z1CPV16 Datasheet, PDF (415/500 Pages) Freescale Semiconductor, Inc – Symbols and Operators, CPU16 Register Mnemonics

Freescale Semiconductor, Inc.
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.
Table D-32 Examples of SCI Baud Rates
Nominal
Baud Rate
500,00.00
38,400.00
32,768.00
19,200.00
9,600.00
4,800.00
2,400.00
1,200.00
600.00
300.00
110.00
64.00
Actual
Baud Rate
524,288.00
37,449.14
32,768.00
19,418.07
9,532.51
4,809.98
2,404.99
1,199.74
599.87
299.94
110.01
64.00
Percent Error Value of SCBR
4.86
–2.48
0.00
1.14
–0.70
0.21
0.21
–0.02
–0.02
–0.02
0.01
0.01
1
14
16
27
55
109
218
437
874
1,748
4,766
8,191
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 — SCI Control Register 1
15
14
13
12
11
10
NOT USED LOOPS WOMS ILT PT PE
RESET:
0
0
0
0
0
$YFFC0A
9
8
7
6
5
4
3
2
1
0
M WAKE TIE TCIE RIE ILIE TE RE RWU SBK
0
0
0
0
0
0
0
0
0
0
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.
M68HC16 Z SERIES
USER’S MANUAL
REGISTER SUMMARY
For More Information On This Product,
Go to: www.freescale.com
D-41