Z80181 Zilog., Z80181 Datasheet - Page 35

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

Zilog
DS971800500
Read Register 7
Read Register 6
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
*
*
Can only be accessed if the SDLC FIFO enhancement
is enabled (WR15 bit D2 set to 1)
is enabled (WR15 bit D2 set to 1)
Can only be accessed if the SDLC FIFO enhancement
(e) SDLC FIFO Status and Byte Count (LSB)
(f) SDLC FIFO Status and Byte Count (MSB)
*
*
Figure 49. SCC Read Register Bit Functions (Continued)
BC8
BC9
BC10
BC11
BC12
BC13
FDA: FIFO Available Status
1 Status Reads from FIFO
FOS: FIFO Overflow Status
1 FIFO Overflowed
0 Normal
BC0
BC1
BC2
BC3
BC4
BC5
BC6
BC7
Read Register 10
Read Register 12
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
(g)
(h)
S
MART
TC0
TC1
TC2
TC3
TC4
TC5
TC6
TC7
A
CCESS
0
On Loop
0
0
Loop Sending
0
Two Clocks Missing
One Clock Missing
C
Lower Byte
of Time Constant
ONTROLLER
Z80181
2-35
SAC
™