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Z8530 Datasheet(PDF) 91 Page - Zilog, Inc.

Part # Z8530
Description  The Zilog SCC Serial Communication Controller
Download  317 Pages
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Manufacturer  ZILOG [Zilog, Inc.]
Direct Link  http://www.zilog.com
Logo ZILOG - Zilog, Inc.

Z8530 Datasheet(HTML) 91 Page - Zilog, Inc.

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SCC™/ESCC™ User’s Manual
Data Communication Modes
4-16
4.3 BYTE-ORIENTED SYNCHRONOUS MODE (Continued)
Table 4-7. Enabling and Disabling CRC
Direction of Data
Coming into SCC
Shift
Register
Delay
Register
CRC
Notes
H G F E D C B
H G F E D C
H G F E D C
CPU Read
CPU Enables CR
H G F E D
CPU Read
H G F E
CPU Read
CPU Disables CR
H G F
CPU Read
CPU Enables CR
H G
CPU Read
H
CPU Reads & Disca
Read RR1 D
Read H & Disca
Ad
d
B
Bd
C
D
E
F
G
H
C
D*
E
F
G
B
C
D
E
F
e
e
d
e
e
H
G
e
H
CRC Calc on B
CRC Calc on C
CRC Calc is
Disabled on D
CRC Calc on E
CRC Calc on F
CRC Calc on F
Result latched in
Error FIFO †
* Usually D is a end-of-message character indicator.
† The status is latched on the Error FIFO for each received byte. In the calculation of F,
the CRC error flag in the Error FIFO will be 0 for an error free message.
d = disabled
e = enabled
A B C D E F G H
A = SYNC
B - F = Data with E = CRC1 and F = CRC2
G and H are arbitrary data (Pad Character)
Legend:
A
Note: No CRC Calculation on "D"
(Sync)
B
(Data1)
C
(Data2)
D
(Data3)
E
(CRC1)
F
(CRC2)
G
(Data)
H
(Data)
Stage
1
2
3
4
5
Receive
Data FIFO
UM010901-0601


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