參數(shù)資料
型號: MC68L11FC0FU4
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: Technical Summary 8-Bit Microcontroller
中文描述: 8-BIT, MICROCONTROLLER, PQFP64
封裝: QFP-64
文件頁數(shù): 44/68頁
文件大?。?/td> 486K
代理商: MC68L11FC0FU4
MOTOROLA
44
MC68HC11F1/FC0
MC68HC11FTS/D
9.2 SCI Registers
TCLR — Clear Baud Rate Counters (TEST)
Bit 6 — Not implemented. Reads always return zero and writes have no effect.
RCKB — SCI Baud-Rate Clock Check (TEST)
SCP[2:0] — SCI Baud Rate Prescaler Selects
These bits determine the baud rate prescaler frequency. Refer to
Table 21
and
Figure 11
.
SCR[2:0] — SCI Baud Rate Selects
These bits determine the receiver and transmitter baud rate. Refer to
Table 22
and
Figure 11
.
The prescaler bits SCP[2:0] determine the highest baud rate, and the SCR[2:0] bits select an additional
binary submultiple (divide by 1, 2, 4,..., through 128) of this highest baud rate. The result of these two
dividers in series is the 16X receiver baud rate clock. The SCR[2:0] bits are not affected by reset and
can be changed at any time. They should not be changed, however, when an SCI transfer is in progress.
NOTES:
1. A blank table cell indicates that an uncommon rate results.
BAUD —
Baud Rate
$x02B
Bit 7
6
5
4
3
2
1
Bit 0
TCLR
SCP2
SCP1
SCP0
RCKB
SCR2
SCR1
SCR0
RESET:
0
0
0
0
0
U
U
U
Table 21 Baud Rate Prescaler Selection
SCP[2:0]
Divide
Internal
Clock By
Prescaler Output
1
XTAL =
8.0 MHz
10.0 MHz
125000
156250
41667
52083
31250
38400
9600
12019
XTAL =
4.0 MHz
62500
20833
15625
4800
XTAL =
4.9152 MHz
76800
25600
19200
5908
XTAL =
XTAL =
12.0 MHz
187500
62500
46875
14423
20830
XTAL =
16.0 MHz
250000
83333
62500
19200
XTAL =
20.0 MHz
312500
104167
76800
24038
XTAL =
24.0 MHz
375000
125000
93750
28846
X00
001
X10
X11
101
1
3
4
13
9
Table 22 Baud Rate Selection
SCR[2:0]
Divide
Prescaler By
Baud Rate
Prescaler
Output =
19200
19200
9600
4800
2400
1200
600
300
150
Prescaler
Output =
4800
4800
2400
1200
600
300
150
75
Prescaler
Output =
9600
9600
4800
2400
1200
600
300
150
75
Prescaler
Output =
38400
38400
19200
9600
4800
2400
1200
600
300
Prescaler
Output =
76800
76800
38400
19200
9600
4800
2400
1200
600
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
1
2
4
8
16
32
64
128
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