Z80181 Zilog., Z80181 Datasheet - Page 30

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

Zilog
System Control Registers
2-30
Upon Reset
Upon Reset
Upon Reset
R/W
R/W
R/W
Bit
Bit
Bit
IL
ITC
RCR
TRAP
REFE REFW
R/W
R/W
R/W
CYC1, 0
IL7
0
0
1
00
01
10
11
R/W
UFO
R/W
IL6
0
R
0
1
Interval of Refresh Cycle
Figure 41. Interrupt Vector Low Register
Figure 42. INT/TRAP Control Register
Figure 43. Refresh Control Register
R/W
IL5
0
1
-
1
-
10 states
20 states
40 states
80 states
0
-
1
1
-
-
0
-
1
1
-
-
ITE2
R/W
0
-
0
1
-
CYC1 CYC0
ITE1
R/W
R/W
0
-
0
0
Addr 33h
Addr 34h
Addr 36h
ITE0
R/W
R/W
0
-
1
0
Interrupt Vector Low
/INT Enable 2, 1, 0
Undefined Fetch Object
TRAP
Cycle Select
Refresh Wait State
Refresh Enable
S
MART
A
CCESS
C
DS971800500
ONTROLLER
Z80181
SAC
™