Z80181 Zilog., Z80181 Datasheet - Page 22

• Manufacturer Part Number: Z80181
• Description: SMART ACCESS CONTROLLER (SAC)
• Manufacturer: Zilog.

Zilog
ASCI CHANNELS CONTROL REGISTERS (Continued)
CSI/O Registers
SS2, 1, 0
000
001
010
011
2-22
TDR0
Write Only
TDR1
Write Only
7
7
Figure 13. ASCI Transmit Data Register (Ch. 0)
Figure 14. ASCI Transmit Data Register (Ch. 1)
6
6
5
5
4
4
3
3
Upon Reset
2
2
Addr 06h
Addr 07h
R/W
1
1
Bit
Baud Rate
Ø
Ø
Ø
Ø
0
0
CNTR
20
40
80
100
EF
R
0
Transmit Data
Transmit Data
R/W
EIE
0
Figure 17. CSI/O Control Register
R/W
RE
0
R/W
TE
0
1
-
SS2, 1, 0
100
101
110
111
TSR0
Read Only
TSR1
Read Only
SS2
R/W
x
x
1
Figure 15. ASCI Receive Data Register (Ch. 0)
Figure 16. ASCI Receive Data Register (Ch. 1)
x
x
SS1
R/W
Ø
Ø
Ø
External Clock
(Frequency < Ø
1
x
x
Addr 0Ah
x
x
320
640
1280
SS0
R/W
1
x
x
Baud Rate
x
x
Addr 08h
Addr 09h
Speed Select
Transmit Enable
Receive Enable
End Interrupt Enable
End Flag
x
x
20)
x
x
S
MART
Received Data
Received Data
A
CCESS
C
DS971800500
ONTROLLER
Z80181
SAC
™