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Z80 Datasheet(PDF) 307 Page - Zilog, Inc.

Part # Z80
Description  Z80 CPU PERIPHERALS
PDF  330 Pages
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Manufacturer  ZILOG [Zilog, Inc.]
Direct Link  http://www.zilog.com
Logo ZILOG - Zilog, Inc.

Z80 Datasheet(HTML) 307 Page - Zilog, Inc.

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Z80 CPU Peripherals
User Manual
UM008101-0601
Serial Input/Output
287
used for both the receiver and transmitter. The system clock in all modes
must be set to at least 4.5 times the data rate. If the x1 clock rate is selected,
bit synchronization must be performed externally.
Write Register 5
WR5 contains control bits that affect the operation of transmitter, with the
exception of D2, which affects the transmitter and receiver.
Transmit CRC Enable (D0)
This bit determines if CRC is calculated on a specific transmit character. If
it is set at the time the character is loaded from the transmit buffer into the
transmit shift register, CRC is calculated on the character. CRC is not auto-
matically sent unless this bit is set when the Transmit Underrun condition
occurs.
Table 25. Clock Rate
Clock Rate 1
Clock Rate 0
Result
0
0
Data Rate x1 = Clock Rate
0
1
Data Rate x16 = Clock Rate
1
0
Data Rate x32 = Clock Rate
1
1
Data Rate x64 = Clock Rate
Table26. WriteRegister5 TransmitterControl
D7
D6
D5
D4
D3
D2
D1
DO
DTR
Tx
Bits/
Char 1
Tx
Bits/
Char 0
Send
Break
Tx
Enable
CRC-16/
SDLC
RTS
Tx
CRC
Enable



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