參數(shù)資料
型號: MC68HC11A1VFU2
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: HCMOS Single-Chip Microcontroller
中文描述: 8-BIT, 2 MHz, MICROCONTROLLER, PQFP64
封裝: QFP-64
文件頁數(shù): 48/158頁
文件大小: 503K
代理商: MC68HC11A1VFU2
MOTOROLA
5-4
SERIAL COMMUNICATIONS INTERFACE
MC68HC11A8
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
SAMPLING CLOCK
SCI SAMPLE EX
PERCEIVED
START BIT
0
0
0
0
1
1
1
1
1
1
1
1
1
1
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
0
0
1
0
1
1
1
1
1
1
1
1
1
1
IDLE
RxD
0
0
0
0
0
1
1
1
1
1
1
1
1
1
IDLE
RxD
NOISE
NOISE
START EDGE
VERIFICATION SAMPLES
PERCEIVED
START BIT
SCI FRM ERR EX
START
BIT
RECEIVE
DATA IN
EXPECTED
STOP BIT
ARTIFICIAL
EDGE
DATA
DATA
DATA
SAMPLES
(a) Case 1, Receive Line Low During Artificial Edge
START
BIT
RECEIVE
DATA IN
EXPECTED
STOP BIT
START
EDGE
DATA
DATA
DATA
SAMPLES
(b) Case 2, Receive Line High During Expected Start Edge
SCI FRM ERR EX
START
BIT
RECEIVE
DATA IN
DETECTED AS VALID
START EDGE
BREAK
DATA
SAMPLES
EXPECTED
STOP BIT
START
QUALIFIERS
START EDGE
VERIFICATION
SAMPLES
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