Z80189 Datasheet, PDF (59/107 Pages) Zilog, Inc. – GENERAL-PURPOSE EMBEDDED CONTROLLERS

Zilog
PRELIMINARY
SYSTEM CONTROL REGISTERS
Z80189/Z8L189
GENERAL-PURPOSE EMBEDDED CONTROLLERS
IL
Addr 33H
Bit
IL7 IL6 IL5 -
-
-
-
-
Upon Reset
00000000
R/W
R/W R/W R/W
Interrupt Vector Low
Figure 68. Interrupt Vector Low Register
ITC
Bit
TRAP UFO -
-
Upon Reset
0
0
1
1
R/W
R/W R
Addr 34H
- ITE2 ITE1 ITE0
1001
R/W R/W R/W
/INT Enable 2, 1, 0
Undefined Fetch Object
TRAP
Figure 69. INT/TRAP Control Register
RCR
Addr 36H
Bit
REFE REFW ^-
-
-
- _{CYC1 CYC0}
Upon Reset
1
1
1
1
1
1
0
0
R/W
R/W R/W
R/W R/W
Cycle Select
Refresh Wait State
Refresh Enable
CYC1, 0
00
01
10
11
Interval of Refresh Cycle
10 states
20 states
40 states
80 states
Figure 70. Refresh Control Register
DS971890301
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