KS57P0504 datasheet(15/282 Pages) SAMSUNG

Part #	KS57P0504

Description	The KS57P0504 is the microcontroller which has 4 Kbyte one-time-programmable ROM and the functions are the same to KS57C0502/C0504

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Manufacturer	SAMSUNG [Samsung semiconductor]

Direct Link	http://www.samsung.com/Products/Semiconductor

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KS57C0502/C0504/P0504 MICROCONTROLLER

ADDRESS SPACES

2–3

+

+ PROGRAMMING TIP — Defining Vectored Interrupt Areas

The following examples show you several ways you can define the vectored interrupt and instruction reference

areas in program memory:

1.

When all vector interrupts are used:

ORG

0000H

;

VENT0

1,0,RESET

;

EMB

← 1, ERB ← 0; Jump to RESET address

VENT1

0,0,INTB

;

EMB

← 0, ERB ← 0; Jump to INTB address

VENT2

0,0,INT0

;

EMB

← 0, ERB ← 0; Jump to INT0 address

VENT3

0,0,INT1

;

EMB

← 0, ERB ← 0; Jump to INT1 address

VENT4

0,0,INTS

;

EMB

← 0, ERB ← 0; Jump to INTS address

VENT5

0,0,INTT0

;

EMB

← 0, ERB ← 0; Jump to INTT0 address

2.

When a specific vectored interrupt such as INT0, and INTT0 is not used, the unused vector interrupt

locations must be skipped with the assembly instruction ORG so that jumps will address the correct

locations:

ORG

0000H

;

VENT0

1,0,RESET

;

EMB

← 1, ERB ← 0; Jump to RESET address

VENT1

0,0,INTB

;

EMB

← 0, ERB ← 0; Jump to INTB address

ORG

0006H

;

INT0 interrupt not used

VENT3

0,0,INT1

;

EMB

← 0, ERB ← 0; Jump to INT1 address

VENT4

0,0,INTS

;

EMB

← 0, ERB ← 0; Jump to INTS address

;

ORG

0010H

;

INTT0 interrupt not used

3.

If an INT0 interrupt is not used and if its corresponding vector interrupt area is not fully utilized, or if it is

not

written by a ORG instruction as in Example 2, a CPU malfunction will occur:

ORG

0000H

;

VENT0

1,0,RESET

;

EMB

← 1, ERB ← 0; Jump to RESET address

VENT1

0,0,INTB

;

EMB

← 0, ERB ← 0; Jump to INTB address

VENT3

0,0,INT1

;

EMB

← 0, ERB ← 0; Jump to INT0 address

VENT4

0,0,INTS

;

EMB

← 0, ERB ← 0; Jump to INT1 address

VENT5

0,0,INTT0

;

EMB

← 0, ERB ← 0; Jump to INTS address

;

ORG

0010H

;

General-purpose ROM area

;

In this example, when an INTS interrupt is generated, the corresponding vector area is not VENT4 INTS,

but VENT5 INTT0. This causes an INTS interrupt to jump incorrectly to the INTT0 address and causes a

CPU malfunction to occur.

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