User’s Manual
C166S V1 SubSystem
Detailed Instruction Set
User’s Manual
6-44
V 1.6, 2001-08
EXTS
Begin EXTended Segment Sequence
EXTS
Group
System Control Instructions
Syntax
EXTS op1, op2
Source Operand(s)
op1
→
segment number
op2
→
2-bit instruction counter
Destination Operand(s)
none
Operation
(count)
←
(op2) [1
≤
op2
≤
4]
Disable interrupts and Class A traps
Data_Segment
←
(op1)
DO WHILE ((count)
≠
0 AND Class_B_Trap_Condition
≠
TRUE)
Next Instruction
(count)
←
(count) - 1
END WHILE
(count)
←
0
Data_Page
←
(DPPx)
Enable interrupts and traps
Description
Overrides the standard DPP addressing scheme of the long and indirect addressing
modes for a specified number of instructions. During their execution, both standard and
PEC interrupts and class A hardware traps are locked. The EXTS instruction becomes
immediately active such that no additional NOPs are required. For any long (’mem’) or
indirect ([...]) address in an EXTS instruction sequence, the value of op1 determines the
8-bit segment (address bits A23-A16) valid for the corresponding data access. The long
or indirect address itself represents the 16-bit segment offset (address bits A15-A0).
The value of op2 defines the length of the effected instruction sequence.
CPU Flags
E
Not affected.
Z
Not affected.
V
Not affected.
C
Not affected.
N
Not affected.
E
Z
V
C
N
-
-
-
-
-
Содержание C166S V1 SubSystem
Страница 10: ...User s Manual C166S V1 SubSystem User s Manual I 6 V 1 6 2001 08...
Страница 16: ...User s Manual C166S V1 SubSystem Introduction User s Manual 1 6 V 1 6 2001 08...
Страница 126: ...User s Manual C166S V1 SubSystem Central Processing Unit User s Manual 3 96 V 1 6 2001 08...
Страница 178: ...User s Manual C166S V1 SubSystem Memory Organization User s Manual 4 52 V 1 6 2001 08...
Страница 206: ...User s Manual C166S V1 SubSystem Instruction Set User s Manual 5 28 V 1 6 2001 08...
Страница 306: ...User s Manual C166S V1 SubSystem Detailed Instruction Set User s Manual 6 100 V 1 6 2001 08...
Страница 362: ...User s Manual C166S V1 SubSystem The External Bus Interface User s Manual 8 40 V 1 6 2001 08...
Страница 452: ...User s Manual C166S V1 SubSystem General Purpose Timer Unit User s Manual 12 44 V 1 6 2001 08...
Страница 454: ...User s Manual C166S V1 SubSystem Instruction Index User s Manual 13 2 V 1 6 2001 08...
Страница 459: ......