T89C51CC02 Atmel, T89C51CC02 Datasheet - Page 28

• Manufacturer Part Number: T89C51CC02
• Description: 8-Bit MCU
• Manufacturer: Atmel

T89C51CC02
8. Data Memory
8.1. Introduction
The T89C51CC02 provides data memory access in two different spaces:
1. The internal space mapped in three separate segments:
A fourth internal segment is available but dedicated to Special Function Registers, SFRs, (addresses 80h to FFh)
accessible by direct addressing mode.
Figure 13 shows the internal data memory spaces organization.
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the lower 128 bytes RAM segment.
the upper 128 bytes RAM segment.
the expanded 256 bytes RAM segment (ERAM).
FFh
00h
Figure 13. Internal Data Memory Organization
Internal ERAM
256 bytes
Preliminary
FFh
7Fh
80h
00h
indirect addressing
direct or indirect
Internal RAM
Internal RAM
addressing
128 bytes
128 bytes
Lower
Upper
FFh
80h
direct addressing
Registers
Function
Special
Rev.A - May 17, 2001