AT80SND1C-ROTIL datasheet(17/210 Pages) ATMEL

17 / 210 page

AT8xC51SND1C

4109E–8051–06/03

Program/Code

Memory

The AT8xC51SND1C implement 64K Bytes of on-chip program/code memory.

Figure 11 shows the split of internal and external program/code memory spaces

depending on the product.

The AT83C51SND1C product provides the internal program/code memory in ROM

memory while the AT89C51SND1C product provides it in Flash memory. These 2 prod-

ucts do not allow external code memory execution.

The Flash memory increases EPROM and ROM functionality by in-circuit electrical era-

sure and programming. The high voltage needed for programming or erasing Flash cells

is generated on-chip using the standard V

DD voltage, made possible by the internal

charge pump. Thus, the AT89C51SND1C can be programmed using only one voltage

and allows In-application software programming. Hardware programming mode is also

available using common programming tools. See the application note ‘Programming

T89C51x and AT89C51x with Device Programmers’.

The AT89C51SND1C implements an additional 4K Bytes of on-chip boot Flash memory

provided in Flash memory. This boot memory is delivered programmed with a standard

boot loader software allowing In-System Programming (ISP). It also contains some

Application Programming Interface routines named API routines allowing In Application

Programming (IAP) by using user’s own boot loader.

Figure 11. Program/Code Memory Organization

ROM Memory

Architecture

As shown in Figure 11 the AT83C51SND1C ROM memory is composed of one space

detailed in the following paragraphs.

Figure 12. AT83C51SND1C Memory Architecture

4K Bytes

Boot Flash

FFFFh

F000h

0000h

64K Bytes

Code Flash

FFFFh

AT89C51SND1C

0000h

64K Bytes

Code ROM

FFFFh

AT83C51SND1C

F000h

FFFFh

64K Bytes

ROM Memory

0000h

User

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