Z80 Datasheet, PDF (259/330 Pages) Zilog, Inc. – Z80 CPU PERIPHERALS

Z80 CPU Peripherals
User Manual
239
Message Flow
Beginning
SYNC
Character
0
7
Data Field
CRC
CRC
Character Character
15 #1 8 7 #2 0
(A) MONOSYNC Message Format (Internal SYNC Detected)
Beginning
SYNC
SYNC
Character Character
0 #1 7 0 #2 7
Data Field
CRC
CRC
Character Character
15 #1 8 7 #2 0
(B) BISYNC Message Format (Internal SYNC Detected)
Beginning
Data Field
CRC
CRC
Character Character
15 #1 8 7 #2 0
(C) External SYNC Detect Format
Figure 112. Synchronous Formats
UM008101-0601
Serial Input/Output