AN1687 データシートの表示（PDF） - Motorola => Freescale
部品番号
コンポーネント説明
メーカー
AN1687 Datasheet PDF : 12 Pages
| |||
AN1687
D/C
CK
CK
NTXA
ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005
U5D
9
8
74HC04A
Figure 6. Encoder
U1
VCC
D7
D6
CK
14 SER
15 A
1B
2C
3D
4E
5F
6G
7H
11 SRCLK
13 SRLOAD
10 SRCLR
12 RCLK
9
QH
D(0-7)
I
74HC597A
U2
U5E
11
10
74HC04A
VCC
VCC
CK
3A
4B
5C
6D
7 ENP
10 ENT
2 CLK
9 LOAD
1 CLR
14 SER
D5
15 A
D4
1B
D3
2C
D2
3D
D1
4E
D0
5F
6G
7H
11 SRCLK
13 SRLOAD
10 SRCLR
12 RCLK
9
QH
U24C 10
8
9
74HC597A
74HC32A
U3
14
QA 13
QB
QC
12
11
QD 15
RCO
U5F
13
12
74HC04A
U15D 13
11
12
74HC86A
VCC
CK
5k
R13
C17 2200 p
C23 4700 p
U24D 13
11
12
74HC32A
U4B
74HC109 11
14 J PR
12 CLK
13 K
CL
Q 10
Q9
15
74HC163A
DOUT
TXR
Figure 7 illustrates the encoding scheme which was
developed for this purpose. Four additional bits surround a
data byte: the I bit, I bit, D/C bit and D/C bit. The function of
these bits are:
I (Invert) Bit: A logic low on this bit indicates that the data
byte and D/C bit are in true form. A logic high on this bit
indicates that the data byte and D/C bit are complemented
from their original form.
I (Invert Bar) Bit: Just the complement of the I bit.
D/C (Data/Control) Bit: A logic low on this bit indicates
that the data byte should be interpreted as a control word. A
logic high on this bit indicates that the data byte contains real
data.
D/C (Data/Control): Just the complement of the D/C bit.
Figure 7.
D/C I
I D0 D1 D2 D3 D4 D5 D6 D7 D/C D/C I
6
MOTOROLA SEMICONDUCTOR APPLICATION INFORMATION
Share Link: 