IS80C286-20 datasheet(8/60 Pages) INTERSIL

Part #	IS80C286-20

Description	High Performance Microprocessor with Memory Management and Protection

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Manufacturer	INTERSIL [Intersil Corporation]

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TABLE 1. FLAGS WORD BIT FUNCTIONS

BIT POSITION

NAME

FUNCTION

0

CF

Carry Flag - Set on high-order bit carry or borrow; cleared otherwise.

2

PF

Parity Flag - Set if low-order 8 bits of result contain an even number of 1 bits; cleared otherwise.

4

AF

Set on carry from or borrow to the low order four bits of AL; cleared otherwise.

6

ZF

Zero Flag - Set if result is zero; cleared otherwise.

7

SF

Sign Flag - Set equal to high-order bit of result (0 if positive, 1 if negative).

11

OF

Overflow Flag - Set if result is a too-large positive number or a too-small negative number (excluding

sign-bit) to fit in destination operand; cleared otherwise.

8

TF

Single Step Flag - Once set, a single step interrupt occurs after the next instruction executes. TF is

cleared by the single step interrupt.

9

IF

Interrupt-Enable Flag - When set, maskable interrupts will cause the CPU to transfer control to an inter-

rupt vector specified location.

10

DF

Direction Flag - Causes string instructions to auto decrement the appropriate index registers when set.

Clearing DF causes auto increment.

CONTROL FLAGS:

TRAP FLAG

INTERRUPT ENABLE

DIRECTION FLAG

SPECIAL FIELDS:

I/O PRIVILEGE LEVEL

NESTED TASK FLAG

TS

EM

MP

PE

CF

PF

AF

ZF

SF

TF

IF

DF

OF

IOPL

NT

FLAGS:

14

15

13

12

11

10

9

8

7

6

5

4

3

2

1

0

1

2

3

15

OVERFLOW

SIGN

ZERO

AUXILIARY CARRY

PARITY

CARRY

STATUS FLAGS:

MSW:

RESERVED

TASK SWITCH

PROCESSOR EXTENSION EMULATED

MONITOR PROCESSOR EXTENSION

PROTECTION ENABLE

FIGURE 2. STATUS AND CONTROL REGISTER BIT FUNCTIONS

80C286

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