S3C72P9 datasheet(39/225 Pages) SAMSUNG

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S3C72P9/P72P9 (Preliminary Spec)

ADDRESSING MODES

3-3

EMB AND ERB INITIALIZATION VALUES

The EMB and ERB flag bits are set automatically by the values of the

RESET vector address and the interrupt

vector address. When a

RESET is generated internally, bit 7 of program memory address 0000H is written to the

EMB flag, initializing it automatically. When a vectored interrupt is generated, bit 7 of the respective vector

address table is written to the EMB. This automatically sets the EMB flag status for the interrupt service routine.

When the interrupt is serviced, the EMB value is automatically saved to stack and then restored when the

interrupt routine has completed.

At the beginning of a program, the initial EMB and ERB flag values for each vectored interrupt must be set by

using VENT instruction. The EMB and ERB can be set or reset by bit manipulation instructions (BITS, BITR)

despite the current SMB setting.

+ PROGRAMMING TIP — Initializing the EMB and ERB Flags

The following assembly instructions show how to initialize the EMB and ERB flag settings:

ORG

0000H

; ROM address assignment

VENT0

1,0,RESET

; EMB

← 1, ERB ← 0; Jump to RESET address by RESET

VENT1

0,1,INTB

; EMB

← 0, ERB ← 1; Jump to INTB address by INTB

VENT2

0,1,INT0

; EMB

← 0, ERB ← 1; Jump to INT0 address by INT0

VENT3

0,1,INT1

; EMB

← 0, ERB ← 1; Jump to INT1 address by INT1

VENT4

0,1,INTS

; EMB

← 0, ERB ← 1; Jump to INTS address by INTS

VENT5

0,1,INTT0

; EMB

← 0, ERB ← 1; Jump to INTT0 address by INTT0

VENT6

0,1,INTT1

; EMB

← 0, ERB ← 1; Jump to INTT1 address by INTT1

VENT7

0,1,INTK

; EMB

← 0, ERB ← 1; Jump to INTK address by INTK

RESET

•

BITR

EMB

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