SN8F5708 datasheet(21/204 Pages) SONIX

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SN8F5708 Series

CPU

Datasheet Rev. 2.4

CPU

SN8F5000 family is an enhanced 8051 microcontroller (MCU). It is fully compatible with MCS-51

instructions, hence the ability to cooperate with modern development environment (e.g. Keil C51).

Generally speaking, SN8F5000 CPU has 9.4 to 12.1 times faster than the original 8051 at the same

frequency.

5.1 Memory Organization

SN8F5708 builds in three on-chip memories: internal RAM (IRAM), external RAM (XRAM), and

program memory (IROM). The internal RAM is a 256-byte RAM which has higher access

performance (direct and indirect addressing). By contrast, the external RAM has 1 KB of size, but it

requires a longer access period. The program memory is a 16 KB non-volatile memory and has a

maximum 8 MHz speed limitation.

0x3FFF

16 KB Flash

Memory

0x03FF

1 KB

RAM

0xFF

256 bytes

RAM

0x0000

0x00

IROM

XRAM

IRAM

5.2 Internal RAM (IRAM)

256 X 8-bit RAM (Internal Data Memory)

Address

RAM Location

000h

Work Register Area

00h-7Fh of RAM is direct

01Fh

and indirect access RAM

020h

Bit Addressable Area

02Fh

030h

…

General Purpose Area

07Fh

080h

General Purpose Area

(Indirect Access)

Special Function Register

(Direct Access)

080h-0FFh store special

function registers.

…

0FFh

End of Bank 0

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