Z8S180 Zilog., Z8S180 Datasheet - Page 151

• Manufacturer Part Number: Z8S180
• Description: ENHANCED Z180 MICROPROCESSOR
• Manufacturer: Zilog.

136
ASCI1 Extension Control Register (I/O Address: 13H) (Z8S180/L180-Class Processors
Only)
UM005001-ZMP0400
Bit
Position Bit/Field
0
Bit
Bit/Field
R/W
Reset
Note: R = Read W = Write X = Indeterminate ? = Not Applicable
Bit
Position Bit/Field
7
6–5
4
3
Z 8018x Fam il y
M PU Us e r M anual
Send
Break
RDRF
Interrupt
Inhibit
Reserved
X1 Bit
Clk
ASCI1
BRG1
Mode
RDRF
Inhibit
R/W
Int
Each ASCI channel control register B configures multiprocessor mode,
parity and baud rate selection.
7
0
R/W
R/W
R/W
R/W
R/W
R/W
?
6
Reserved
Value Description
Value Description
?
0
0
1
0
1
0
0
1
0
1
5
Normal Xmit
Drive TXA Low
RDRF Interrupt Inhibit On
RDRF Interrupt Inhibit Off
Reserved. Must be 0
CKA1 /16 or /64
CKA1 is bit clock
As S180
Enable 16-bit BRG counter
ASCI1
X1 Bit
R/W
Clk
4
0
BRG1
Mode
R/W
3
0
Feature
Enable
Break
R/W
2
0
Detect
Break
(RO)
R/W
1
0
Break
Send
R/W
0
0