8XC198

272034 – 1

Figure 1 87C198 Block Diagram

EXTERNAL MEMORY OR IO

0FFFFH

4000H

INTERNAL ROMEPROM OR

EXTERNAL MEMORY

2080H

RESERVED

2040H

UPPER 8 INTERRUPT VECTORS

2030H

ROMOTP SECURITY KEY

2020H

RESERVED

2019H

CHIP CONFIGURATION BYTE

2018H

RESERVED

2014H

LOWER 8 INTERRUPT VECTORS

PLUS 2 SPECIAL INTERRUPTS

2000H

PORT 3 AND PORT 4

1FFEH

EXTERNAL MEMORY OR IO

0100H

INTERNAL DATA MEMORY - REGISTER FILE

(STACK POINTER RAM AND SFRS)

EXTERNAL PROGRAM CODE MEMORY

0000H

Figure 2 Memory Map

272034 – 7

Figure 3 Chip Configuration (2018H)

WARNING

Reserved memory locations must not be written or read The contents andor function of these locations may change with

future revisions of the device Therefore a program that relies on one or more of these locations may not function properly

2