Siemens EF 88H Series Bedienungsanleitung PDF herunterladen (Seite 78)

Device Specification

Semiconductor Group 7-16

Functional Description

The SAB 80C517A is based on 8051 architecture. It is a fully compatible member of the

Siemens SAB 8051/80C51 microcontroller family being an significantly enhanced

SAB 80C517. The SAB 80C517A is therefore compatible with code written for the

SAB 80C517.

Having an 8-bit CPU with extensive facilities for bit-handling and binary BCD arithmetics the

SAB 80C517A is optimized for control applications. With a 18 MHz crystal, 58 % of the

instructions are executed in 666.67 ns.

Being designed to close the performance gap to the 16-bit microcontroller world, the

SAB 80C517A’s CPU is supported by a powerful 32-/16-bit arithmetic unit and a more flexible

addressing of external memory by eight 16-bit datapointers.

Memory Organisation

According to the SAB 8051 architecture, the SAB 80C517A has separate address spaces for

program and data memory. Figure 2 illustrates the mapping of address spaces.

Figure 2

Memory Map

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 136 137

Keine Kommentare

Siemens EF 88H Series Bedienungsanleitung Seite 78