MC68HC05P18A Datasheet, PDF (32/130 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Memory Map
Freescale Semiconductor, Inc.
Addr.
Register Name
Bit 7
6
5
4
Read: CC
0
A/D Converter Status and
R
ADON
$001E Control Register (ADSCR) Write:
See page 94.
Reset: 0
0
0
0
$001F
Reserved
R
R
R
R
3
2
1
Bit 0
0
CH2 CH1 CH0
0
0
0
0
R
R
R
R
= Unimplemented
R = Reserved
Figure 2-3. I/O and Control Registers (Sheet 4 of 4)
U = Unaffected
2.5 RAM
The user RAM consists of 192 bytes (including the stack) at locations
$0050–$010F. 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.
2.6 ROM
There are 8064 bytes of user ROM available, consisting of:
• 8000 bytes at locations $1FC0–$3EFF
• 48 bytes in page zero locations $0020–$004F
• 16 additional bytes for user vectors at locations $3FF0–$3FFF
NOTE:
Address space $3F00–$3FEF is reserved for test code. Unlike other
M68HC05 devices, the MC68HC05P18A does not contain self-check
code.
Technical Data
Memory Map
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MC68HC05P18A