NEC uPD78053(A) Manuale Utente

The internal program memory space

 

stores programs and table data.  Normally, they are addressed with a program

counter (PC).

Each product of the 

µ

PD78054 and 78054Y Subseries has the internal ROM (or PROM) of the size shown below.

Part number

Internal ROM

Type

Capacity

µ

PD78052, 78052Y

Mask ROM

16384 x 8 bits (0000H to 3FFFH)

µ

PD78053, 78053Y

24576 x 8 bits (0000H to 5FFFH)

µ

PD78054, 78054Y

32768 x 8 bits (0000H to 7FFFH)

µ

PD78055, 78055Y

40960 x 8 bits (0000H to 9FFFH)

µ

PD78056, 78056Y

49152 x 8 bits (0000H to BFFFH)

µ

PD78058, 78058Y

61440 x 8 bits (0000H to EFFFH)

µ

PD78P054

PROM

32768 x 8 bits (0000H to 7FFFH)

µ

PD78P058, 78P058Y

61440 x 8 bits (0000H to EFFFH)

The following areas are allocated to the internal program memory space.

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

Vector Table Address

Interrupt Source

Vector Table Address

Interrupt Source

0000H

RESET input

0018H

INTSER

0004H

INTWDT

001AH

INTSR/INTCSI2

0006H

INTP0

001CH

INTST

0008H

INTP1

001EH

INTTM3

000AH

INTP2

0020H

INTTM00

000CH

INTP3

0022H

INTTM01

000EH

INTP4

0024H

INTTM1

0010H

INTP5

0026H

INTTM2

0012H

INTP6

0028H

INTAD

0014H

INTCSI0

003EH

BRK

0016H

INTCSI1

The 64-byte area 0040H to 007FH can store the subroutine entry address of a 1-byte call instruction (CALLT).

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