參數(shù)資料
型號(hào): MC68HC11A8BVP2
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDIP48
封裝: PLASTIC, DIP-48
文件頁數(shù): 102/158頁
文件大小: 3803K
代理商: MC68HC11A8BVP2
SERIAL COMMUNICATIONS INTERFACE
MC68HC11A8
5-4
TECHNICAL DATA
5
Figure 5-3 Examples of Start Bit Sampling Techniques
Figure 5-4 SCI Artificial Start Following a Framing Error
Figure 5-5 SCI Start Bit Following a Break
16X INTERNAL
SCI SAMPLE EX
PERCEIVED
SAMPLING CLOCK
00
0
111
11
1
R
T
2
R
T
3
R
T
4
R
T
5
R
T
6
R
T
7
R
T
8
R
T
IDLE
RxD
00
1
0
111
11
IDLE
RxD
00
0
011
111
11
IDLE
RxD
NOISE
START EDGE
VERIFICATION SAMPLES
START BIT
PERCEIVED
START BIT
SCI FRM ERR EX
START
RECEIVE
EXPECTED
STOP BIT
ARTIFICIAL
EDGE
DATA
DATA IN
BIT
DATA
SAMPLES
(a) Case 1, Receive Line Low During Artificial Edge
START
RECEIVE
EXPECTED
STOP BIT
START
EDGE
DATA
DATA IN
BIT
DATA
SAMPLES
(b) Case 2, Receive Line High During Expected Start Edge
SCI FRM ERR EX
START
RECEIVE
DETECTED AS VALID
START EDGE
BREAK
DATA IN
BIT
DATA
SAMPLES
EXPECTED
STOP BIT
START
QUALIFIERS
START EDGE
VERIFICATION
SAMPLES
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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