SN8A1702AX datasheet(17/112 Pages) SONIX

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Preliminary

SN8P1702A/SN8P1703A

8-bit micro-controller build-in 12-bit ADC

SONiX TECHNOLOGY CO., LTD

Page 17

Revision 0.5

3 ADDRESS SPACES

PROGRAM MEMORY (ROM)

OVERVIEW

ROM Maps for SN8P1702A/SN8P1703A devices provide 1K x 16-bit program memory. The SN8P1702A/SN8P1703A

program memory is able to fetch instructions through 12-bit wide PC (Program Counter) and can look up ROM data by

using ROM code registers (R, X, Y, Z). In standard configuration, the device’s 1,024 x 16-bit program memory has four

areas:

1-word reset vector addresses

1-word Interrupt vector addresses

5-words reserved area

1K words

(SN8P1702)

All of the program memory is partitioned into three coding areas. The first area is located from 00H to 03H(The Reset

vector area), the second area is a reserved area 04H ~07H, the third area is for the interrupt vector and the user code

area from 0008H to 03FEH. The address 08H is the interrupt enter address point.

ROM

0000H

Reset vector

User reset vector

0001H

Jump to user start address

0002H

Jump to user start address

0003H

General purpose area

Jump to user start address

0004H

0005H

0006H

0007H

Reserved

0008H

Interrupt vector

User interrupt vector

0009H

User program

000FH

0010H

0011H

03FEH

General purpose area

End of user program

03FFH

Reserved

Figure 3-1. ROM Address Structure

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