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MB89143A/144A

s CPU CORE

1. Memory Space

The microcontrollers of the MB89143A/144A series offer a memory space of 64 Kbytes for storing all of I/O,

data, and program areas. The I/O area is located at the lowest address. The data area is provided immediately

above the I/O area. The data area can be divided into register, stack, and direct areas according to the application.

The program area is located at exactly the opposite end, that is, near the highest address. Provide the tables

of interrupt reset vectors and vector call instructions toward the highest address within the program area. The

memory space of the MB89143A/144A series is structured as illustrated below.

MB89143A

I/O

RAM

256

Register

Not available

ROM

8 KB

MB89144A

I/O

RAM

256

Register

ROM

12 KB

Not available