T89C5115 ATMEL Corporation, T89C5115 Datasheet - Page 22

• Manufacturer Part Number: T89C5115
• Description: Low Pin Count 8-bit MCU with A/D Converter and 16-Kbytes of Flash Memory
• Manufacturer: ATMEL Corporation

Upper 128 Bytes RAM
Expanded RAM
22
T89C5115
Figure 8. Lower 128 bytes Internal RAM Organization
The upper 128 bytes of RAM are accessible from address 80h to FFh using only indirect
addressing mode.
The on-chip 256 bytes of expanded RAM (ERAM) are accessible from address 0000h to
00FFh using indirect addressing mode through MOVX instructions. In this address
range.
Note:
Lower 128 bytes RAM, Upper 128 bytes RAM, and expanded RAM are made of volatile
memory cells. This means that the RAM content is indeterminate after power-up and
must then be initialized properly.
30h
20h
18h
10h
08h
00h
7Fh
2Fh
1Fh
0Fh
17h
07h
Bit-Addressable Space
(Bit Addresses 0-7Fh)
4 Banks of
8 Registers
R0-R7
4128A–8051–04/02