Z80181 Zilog., Z80181 Datasheet - Page 34

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

Zilog
SCC REGISTERS (Continued)
2-34
Read Register 0
Read Register 1
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
(a)
(b)
Figure 49. SCC Read Register Bit Functions
Rx Character Available
Zero Count
Tx Buffer Empty
DCD
Sync/Hunt
CTS
Tx Underrun/EOM
Break/Abort
All Sent
Residue Code 2
Residue Code 1
Residue Code 0
Parity Error
Rx Overrun Error
CRC/Framing Error
End of Frame (SDLC)
Read Register 2
Read Register 3
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
*
Modified if VIS bit in Write register 9 is set.
(c)
(d)
S
MART
A
CCESS
V0
V1
V2
V3
V4
V5
V6
V7
0
0
0
Ext/Status IP
Tx IP
Rx IP
0
0
C
DS971800500
ONTROLLER
Interrupt
Vector
Z80181
SAC
*
™