HC705P6AGRSSLASHD datasheet(28/134 Pages) NXP

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Memory

General Release Specification

MC68HC705P6A — Rev. 1.0

Memory

2.6 RAM

The user RAM consists of 176 bytes (including the stack) at locations

$0050 through $00FF. The stack begins at address $00FF. The stack

pointer can access 64 bytes of RAM from $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.

2.7 EPROM/ROM

There are 4608 bytes of user EPROM at locations $0100 through

$12FF, plus 48 bytes in user page zero locations $0020 through $004F,

and 16 additional bytes for user vectors at locations $1FF0 through

$1FFF. The bootloader ROM and vectors are at locations $1F01 through

$1FEF.

2.8 Mask Option Register (MOR) $1EFF–$1F00

The MOR is a pair of EPROM bytes located at $1EFF and $1F00. It

controls the programmable options on the MC68HC705P6A. See

Section 11. Mask Option Register (MOR) for additional information.

$1EFF

Bit 7

654321

Bit 0

Read:

PA7PU

PA6PU

PA5PU

PA4PU

PA3PU

PA2PU

PA1PU

PA0PU

Write:

Erased

State:

00000000

$1F00

Bit 7

654321

Bit 0

Read:

SECURE

SWAIT

SPR1

SPR0

LSBF

LEVEL

COP

Write:

Erased

State:

00000000

= Unimplemented

Figure 2-4. Mask Option Register

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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