Z8S180 Zilog., Z8S180 Datasheet - Page 153
Z8S180
Manufacturer Part Number
Z8S180
Description
ENHANCED Z180 MICROPROCESSOR
Manufacturer
Zilog.
Datasheet
1.Z8S180.pdf
(326 pages)
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ASCI1 Time Constant Low Register (I/O Address: 1CH) (Z8S180/L180-Class Processors
Only)
ASCI1 Time Constant High Register (I/O Address: 1DH) (Z8S180/L180-Class Processors
Only)
UM005001-ZMP0400
Bit
R/W
Reset
Note: R = Read W = Write X = Indeterminate ? = Not Applicable
Bit
R/W
Reset
Note: R = Read W = Write X = Indeterminate ? = Not Applicable
Z 8018x Fam il y
M PU Us e r M anual
R/W
R/W
7
0
7
0
Modem Control Signals
ASCI channel 0 has CTS0, DCD0 and RTS0 external modem control
signals. ASCI channel 1 has a CTS1 modem control signal which is
multiplexed with Clocked Serial Receive Data (RXS).
CTS0: Clear to Send 0 (Input)
The CTS0 input allows external control (start/stop) of ASCI channel 0
transmit operations. When CTS0 is High, the channel 0 TDRE bit is held
at
When CTS0 is Low, TDRE reflects the state of TDR0. The actual
transmit operation is not disabled by CT High, only TDRE is inhibited:
DCD0: Data Carrier Detect 0 (Input)
The DCD0 input allows external control (start/stop) of ASCI channel 0
receive operations. When DCD0 is High, the channel 0 RDRF bit is held
at 0 whether or not the RDR0, (Receive Data Register) is full or empty.
0
whether or not the TDR0 (Transmit Data Register) is full or empty.
R/W
R/W
6
6
0
0
R/W
R/W
5
0
5
0
R/W
R/W
4
4
0
0
R/W
R/W
3
0
3
0
R/W
R/W
2
2
0
0
R/W
R/W
1
0
1
0
R/W
R/W
0
0
0
0
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