UPD78044F datasheet(56/472 Pages) NEC

56 / 472 page

Chapter 3

CPU Architecture

User’s Manual U16504EE1V1UD00

(1)

Vector table area

The 64-byte area 0000H to 003FH is reserved as a vector table area. The RESET input and pro-

gram start addresses for branch upon generation of each interrupt request are stored in the vector

table area.

Of the 16-bit address, low-order 8 bits are stored at even addresses and high-order 8 bits are

stored at odd addresses.

(2)

CALLT instruction table area

The 64-byte area 0040H to 007FH can store the subroutine entry address of a 1-byte call instruc-

tion (CALLT).

(3)

CALLF instruction entry area

The area 0800H to 0FFFH can perform a direct subroutine call with a 2-byte call instruction

(CALLF).

Table 3-2:

Vectored Interrupts

Vector Table Address

Interrupt Request

0004H

INWDT

0006H

INTAD

0008H

INTOVF

000AH

INTTM20

000CH

INTTM21

000EH

INTTM22

0010H

INTP0

0012H

INTP1

0014H

INTP2

0016H

INTCE

0018H

INTCR

001AH

INTCT0

001CH

INTCT1

001EH

INTCSI30

0020H

INTSER0

0022H

INTSR0

0024H

INTST0

0026H

INTTM50

0028H

INTTM51

002AH

INTTM52

002EH

INTWTI

0030H

INTWT

0032H

INTCSI31

003EH

BRK

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