Freescale Semiconductor, Inc.
Me m ory
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 Ma sk Op tion Re g iste r (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
Read:
Write:
Bit 7
6
5
4
3
2
1
Bit 0
PA7PU
PA6PU PA5PU
PA4PU
PA3PU PA2PU
PA1PU
PA0PU
Erased
State:
0
0
6
0
0
0
0
0
0
$1F00
Read:
Write:
Bit 7
5
4
3
2
1
Bit 0
COP
SECURE
SWAIT
SPR1
SPR0
LSBF
LEVEL
Erased
State:
0
0
0
0
0
0
0
0
= Unimplemented
Figure 2-4. Mask Option Register
General Release Specification
MC68HC705P6A — Rev. 1.0
Memory
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