CS80C286-16 Intersil, CS80C286-16 Datasheet - Page 18

• Manufacturer Part Number: CS80C286-16
• Description: IC CPU 16BIT 5V 16MHZ 68-PLCC
• Manufacturer: Intersil

Specifications of CS80C286-16

• Processor Type: 80C286 16-Bit
• Speed: 16MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 68-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -

Definition
Type
Field
POSITION
TABLE 10. CODE AND DATA SEGMENT DESCRIPTOR FORMATS - ACCESS RIGHTS BYTE DEFINITION
6 - 5
BIT
7
4
3
2
1
3
2
1
0
Present (P)
Descriptor Privilege
Level (DPL)
Segment Descriptor (S) S = 1
Executable (E)
Expansion Direction
(ED)
Writable (W)
Executable (E)
Conforming (C)
Readable (R)
Accessed (A)
NAME
E = 0
E = 1
P = 1
P = 0
S = 0
ED = 0
ED = 1
W = 0
W = 1
C = 1
R = 0
R = 1
A = 0
A = 1
Segment is mapped into physical memory.
No mapping to physical memory exits, base and limit are not used.
Segment privilege attribute used in privilege tests.
Code or Data (includes stacks) segment descriptor
System Segment Descriptor or Gate Descriptor
Data segment descriptor type is:
Expand up segment, offsets must be ≤ limit.
Expand down segment, offsets must be > limit.
Data segment may not be written into.
Data segment may be written into.
Code Segment Descriptor type is:
Code segment may only be executed when CPL ≥
DPL and CPL remains unchanged.
Code segment may not be read.
Code segment may be read.
Segment has not been accessed.
Segment selector has been loaded into segment register or used by selector
test instructions.
80C286
18
FUNCTION
If Data Segment
(S = 1, E = 0)
If Code Segment
(S = 1, E = 1)