MC68HCP11 Datasheet, PDF (25/45 Pages) Motorola, Inc – 8-Bit Microcontroller

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