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68HC05P9A Fiches technique(PDF) 21 Page - Freescale Semiconductor, Inc

No de pièce 68HC05P9A
Description  SPECIFICATION(General Release)
PDF  90 Pages
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Fabricant  FREESCALE [Freescale Semiconductor, Inc]
Site Internet  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

68HC05P9A Fiches technique(HTML) 21 Page - Freescale Semiconductor, Inc

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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.
For More Information On This Product,
Go to: www.freescale.com



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