MC68HC711K4CFN4 Datasheet, PDF (52/80 Pages) Motorola, Inc – 8-Bit Microcontroller

SCBDH/L —SCI Baud Rate Control High/Low
$0070
RESET:
Bit 7
BTST
0
6
BSPL
0
5
4
3
2
1
— SBR12 SBR11 SBR10 SBR9
0
0
0
0
0
$0070, $0071
Bit 0
SBR8
0
High
$0071 SBR7 SBR6 SBR5 SBR4 SBR3 SBR2 SBR1 SBR0
Low
RESET:
0
0
0
0
0
1
0
0
BTST —Baud Register Test (TEST)
Factory test only
BSPL —Baud Rate Counter Split (TEST)
Factory test only
Bit 5 —Not implemented
Always reads zero
SBR[12:0] —SCI Baud Rate Selects
Use the following formula to calculate SCI baud rate. Refer to the table of baud rate control values for
example rates.
SCI baud rate = EXTAL ÷[16 ∗ (2 ∗ BR)]
Where BR is the contents of SCBDH/L (BR = 1, 2, 3 ... 8191).
BR = 0 disables the baud rate generator.
Target
Baud
Rate
110
150
300
600
1200
2400
4800
9600
19.2 K
38.4 K
Table 7 SCI Baud Rate Control Values
8 MHz
Dec Value
Hex Value
2272
$08E0
1666
$0682
833
$0341
416
$01A0
208
$00D0
104
$0068
52
$0034
26
$001A
13
$000D
—
—
Crystal Frequency (EXTAL)
12 MHz
Dec Value
Hex Value
3409
$0D51
2500
$09C4
1250
$04E2
625
$0271
312
$0138
156
$009C
78
$004E
39
$0027
20
$0014
—
—
16 MHz
Dec Value
Hex Value
4545
$11C1
3333
$0D05
1666
$0682
833
$0341
416
$01A0
208
$00D0
104
$0068
52
$0034
26
$001A
13
$000D
SCCR1 —SCI Control 1
Bit 7
6
5
LOOPS WOMS —
RESET:
0
1
0
0
0
0
$0072
4
3
2
1
Bit 0
M WAKE ILT PE
PT
0
0
0
0
0
Bootstrap
Mode
0
0
0
0
0
Other Modes
MOTOROLA
52
M68HC11 K Series
MC68HC11KTS/D