mc68hc11c0 Freescale Semiconductor, Inc, mc68hc11c0 Datasheet - Page 64

• Manufacturer Part Number: mc68hc11c0
• Description: 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

RCKB — SCI Baud Rate Clock Check
SCR2, SCR1, and SCR0 — SCI Baud Rate Selects
SCCR1 — SCI Control Register 1
R8 — Receive Data Bit 8
T8 — Transmit Data Bit 8
Bit 5 — Not implemented
64
MOTOROLA
RESET:
RCKB can only be set in test modes.
Selects receiver and transmitter bit rate based on output from baud rate prescaler stage. Shaded boxes
in the table below contain the prescaler output rates shown in the preceding table. Refer to the SCI Baud
Rate Clock Diagram.
When the M-bit is set, R8 stores the ninth data bit in the receive data character. R8 can also be used
with 8-bit data to support several special receive data formats. R8 remains unchanged following a trans-
mission and may be used again without rewriting it.
When the M-bit is set, T8 stores the ninth data bit in the transmit data character. T8 can also be used
with 8-bit data to support several special transmit data formats. T8 remains unchanged following a
transmission and may be used again without rewriting it.
Always reads zero
1 = Exclusive-OR of the RT clock driven out TxD pin for testing purposes.
0 = Normal SCI operation
Bit 7
R8
U
SCR[2:0]
SCP[1:0]
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
0 0
0 1
1 0
1 1
T8
U
6
Freescale Semiconductor, Inc.
For More Information On This Product,
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5
0
Divide Internal
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Prescaler
Clock By
Divide
M
4
0
128
By
16
32
64
13
1
2
4
8
1
3
4
WAKE
3
0
(Prescaler Output from Previous Table)
4800 K
15.625 K
4800
2400
1200
4.0 MHz
37.5
62.50 K
20.83 K
600
300
150
(Baud)
4800 K
75
—
2
0
Crystal Frequency in MHz
Baud Rate
8.0 MHz
—
125.0 K
41.67 K
31.25 K
(Baud)
9600 K
1
0
9600 K
9600
4800
2400
1200
600
300
150
75
Bit 0
$002C
—
0
12.0 MHz
187.5 K
46.88 K
(Baud)
62.5 K
14.4 K
MC68HC11C0TS/D
14.4 K
112.5
7200
3600
1800
1200
14.4
450
225
MC68HC11C0