mc68hc11f1cpu3 Freescale Semiconductor, Inc, mc68hc11f1cpu3 Datasheet - Page 41

• Manufacturer Part Number: mc68hc11f1cpu3
• Description: Mc68hc11f1 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

4.2.2 Memory Map
4.2.2.1 RAM
TECHNICAL DATA
$FE00
$FFFF
The MC68HC11F1 microcontroller has 1024 bytes of fully static RAM that can be used
for storing instructions, variables, and temporary data during program execution. RAM
can be placed at any 4-Kbyte boundary in the 64 Kbyte address space by writing an
appropriate value to the INIT register.
RAM is initially located at $0000 in the memory map upon reset. Direct addressing
mode can access the first 256 locations of RAM using a one-byte address operand.
Direct mode accesses save program memory space and execution time.
The on-chip RAM is a fully static memory. RAM contents can be preserved during pe-
riods of processor inactivity by either of two methods, both of which reduce power con-
sumption.
$0000
$1000
NOTES:
SINGLE
1. RAM can be remapped to any 4-Kbyte boundary ($x000). "x" represents the value contained in
2. The register block can be remapped to any 4-Kbyte boundary ($y000). "y" represents the value contained in
3. Special test mode vectors are externally addressed.
4. In special test mode the address locations $zD00–$zDFF are not externally addressable.
5. EEPROM can be remapped to any 4-Kbyte boundary ($z000). "z" represents the value contained in
CHIP
RAM[3:0] in the init register.
reg[3:0] in the init register.
"z" represents the value of bits EE[3:0] in the config register.
EE[3:0] in the config register.
EXPANDED
EXT
EXT
Freescale Semiconductor, Inc.
Figure 4-1 MC68HC11F1 Memory Map
OPERATING MODES AND ON-CHIP MEMORY
For More Information On This Product,
BOOTSTRAP
Go to: www.freescale.com
SPECIAL
TEST
EXT
EXT
EXT
BF00
zD00
zDFF
zFFF
y000
zE00
x000
x3FF
y05F
1024 BYTES RAM
96-BYTE REGISTER BLOCK
256 BYTES BOOTSTRAP ROM
256 BYTES RESERVED
(SPECIAL TEST MODE ONLY)
512 BYTES EEPROM
BFC0
BFFF
FFC0
FFFF
1
5
4
SPECIAL MODE
INTERRUPT
VECTORS
NORMAL MODE
INTERRUPT
VECTORS
2
3
4-3