Samsung 8-Bit CMOS Microcontroller, S3C9228/P9228 user manual Address Spaces

S3C9228/P9228 ADDRESS SPACES

2 ADDRESS SPACES

OVERVIEW

The S3C9228/P9228 microcontroller has three kinds of address space:

—Program memory (ROM)

—Internal register file

—LCD display register file

A 16-bit address bus supports program memory operations. Special instructions and related internal logic determine when the 16-bit bus carries addresses for program memory. A separate 8-bit register bus carries addresses and data between the CPU and the internal register file.

The S3C9228 has 8K bytes of mask-programmable program memory on-chip. The S3C9228/P9228 microcontroller has 244 bytes general-purpose registers in its internal register file and the 20 bytes for LCD display memory is implemented in the internal register file too. Fifty-six bytes in the register file are mapped for system and peripheral control functions.

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