68HC05P9A datasheet(21/90 Pages) FREESCALE

Nome de Peças	68HC05P9A

Descrição Electrónicos	SPECIFICATION(General Release)

PDF	90 Pages

Scroll/Zoom	100%

Fabricante Electrônico	FREESCALE [Freescale Semiconductor, Inc]

Página de início	http://www.freescale.com

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21 / 90 page

GENERAL RELEASE SPECIFICATION

MEMORY

Rev. 2.0

2-3

2.1

ROM

The user ROM consists of 48 bytes of page zero ROM from $0020 to $004F, 2048

bytes of ROM from $0100 to $08FF, and 16 bytes of user vectors from $1FF0 to

$1FFF. The self-check ROM and vectors are located from $1F00 to $1FEF.

2.2

ROM Security Feature

A security feature has been incorporated into the MC68HC05P9A to help prevent

external reading of code in the ROM. Placing unique customer code at ROM

locations $0028-$002F aids in keeping customer developed software proprietary.

2.3

RAM

The user RAM consists of 128 bytes of a shared stack area. The stack begins at

address $00FF. The stack pointer can access 64 bytes of RAM in the range

$00FF to $00C0.

NOTE

Using the stack area for data storage or temporary work locations

requires care to prevent it from being overwritten due to stacking

from an interrupt or subroutine call.

Freescale Semiconductor, Inc.

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68HC05P9A Folha de dados(PDF) 21 Page - Freescale Semiconductor, Inc