MC68HC11A1 MOTOROLA [Motorola, Inc], MC68HC11A1 Datasheet - Page 25

• Manufacturer Part Number: MC68HC11A1
• Description: 8-Bit Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

BAUD — Baud Rate
TCLR — Clear Baud Rate Counters (TEST)
SCP1, SCP0 — SCI Baud Rate Prescaler Selects
RCKB — SCI Baud Rate Clock Check (TEST)
SCR2, SCR1, and SCR0 — SCI Baud Rate Selects
MC68HC11A8
MC68HC11A8TS/D
RESET:
Selects receiver and transmitter bit rate based on output from baud rate prescaler stage.
TCLR
Bit 7
0
SCP[1:0]
SCP[2:0]
00
01
10
11
000
001
010
011
100
101
110
111
6
0
0
Internal
Divide
Clock
SCP1
By
Prescaler
13
5
0
1
3
4
Divide
128
By
16
32
64
1
2
4
8
SCP0
4
0
4.0 MHz
15.625K
(Baud)
62.50K
20.83K
4800
(Prescaler Output from Previous Table)
4800
4800
2400
1200
600
300
150
RCKB
—
—
3
0
Crystal Frequency in MHz
8.0 MHz
(Baud)
125.0K
41.67K
31.25K
9600
Highest Baud Rate
SCR2
U
2
9600
9600
4800
2400
1200
600
300
150
—
10.0 MHz
156.25K
SCR1
(Baud)
52.08K
12.02K
38.4K
U
1
$102B
SCR0
38.4K
38.4K
19.2K
Bit 0
9600
4800
2400
1200
600
300
U
12.0 MHz
(Baud)
187.5K
46.88K
14.42K
62.5K
MOTOROLA
25