參數(shù)資料
型號(hào)： MC68HC11EA9VFN3
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PQCC52
封裝： PLASTIC, LCC-52
文件頁(yè)數(shù)： 46/58頁(yè)
文件大?。?/td> 583K
代理商： MC68HC11EA9VFN3
MOTOROLA
MC68HC11EA9
50
MC68HC11EA9TS/D
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 Select Bits
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
÷ (32 BR)
where BR is the contents of SBR[12:0] in SCBDH,L (BR = 1, 2, 3 ... 8191 decimal, or BR = $0001,
$0002, $0003 ... $1FFF hexadecimal)
BR = 0 disables the baud rate generator.
SCBDH, SCBDL — SCI Baud Rate Select High, SCI Baud Rate Select Low
$1028, $1029
BIT 7
654321
BIT 0
$1028
BTST
BSPL
—
SBR12
SBR11
SBR10
SBR9
SBR8
High
RESET:
00000000
$1029
SBR7
SBR6
SBR5
SBR4
SBR3
SBR2
SBR1
SBR0
Low
RESET:
00000100
Table 22 Baud Rate Selection
Target
Crystal Frequency (XTAL)
Baud
8 MHz
12 MHz
16 MHz
Rate
Dec Value Hex Value Dec Value Hex Value Dec Value Hex Value
110
2272
$08E0
3409
$0D51
4545
$11C1
312
156
78
2500
$09C4
3333
$0D05
300
833
$0341
1250
$04E2
1666
$0682
600
416
$01A0
625
$0271
833
$0341
1200
208
$00D0
312
$0138
416
$01A0
2400
104
$0068
156
$009C
208
$00D0
4800
52
$0034
78
$004E
104
$0068
9600
26
$001A
39
$0027
52
$0034
19.2K
13
$000D
20
$0014
26
$001A
38.4K
————
13
$000D
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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