Z8S180 Zilog., Z8S180 Datasheet - Page 133
Z8S180
Manufacturer Part Number
Z8S180
Description
ENHANCED Z180 MICROPROCESSOR
Manufacturer
Zilog.
Datasheet
1.Z8S180.pdf
(326 pages)
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ASCI Transmit Data Register Ch. 0 (TDR0: 06H)
UM005001-ZMP0400
Bit
Bit/Field
R/W
Reset
Note: R = Read W = Write X = Indeterminate ? = Not Applicable
Bit
Bit/Field
R/W
Reset
Note: R = Read W = Write X = Indeterminate ? = Not Applicable
ASCI Transmit Data Register Ch. 1 (TDR1: 07H)
Z 8018x Fam il y
M PU Us e r M anual
7
7
When transmission is completed, the next byte (if available) is
automatically loaded from TDR into TSR and the next transmission
starts. If no data is available for transmission, TSR idles by outputting a
continuous High level. The TSR is not program-accessible.
ASCI Transmit Data Register 0, 1(TDR0,1:I/O Address = 06H, 07H)
Data written to the ASCI Transmit Data Register is transferred to the TSR
as soon as TSR is empty. Data can be written while TSR is shifting out
the previous byte of data. Thus, the ASCI transmitter is double buffered.
Data can be written into and read from the ASCI Transmit Data Register.
If data is read from the ASCI Transmit Data Register, the ASCI data
transmit operation is not affected by this read operation.
6
6
5
5
ASCI Transmit Channel 0
ASCI Transmit Channel 1
4
4
R/W
R/W
0
0
3
3
2
2
1
1
0
0
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