Program Memory - Intel 8XC196MC User Manual

8XC196MC, MD, MH USER'S MANUAL
Device and
Hex Address
Range
MC, MD MH
FFFF FFFF External device (memory or I/O) connected to the
6000 A000 address/data bus
5FFF 9FFF Program memory (internal nonvolatile or external
2080 2080 memory); see Note 1.
207F 207F Special-purpose memory (internal nonvolatile or
2000 2000 external memory)
1FFF 1FFF
Memory-mapped SFRs
1FE0 1FE0
1FDF 1FDF
Peripheral SFRs
1F00 1F00
1EFF 1EFF External device (memory or I/O) connected to the
0200 0300 address/data bus (future SFR expansion; see Note 2)
01FF 02FF
Upper register file (general-purpose register RAM)
0100 0100
00FF 00FF Lower register file (general-purpose register RAM,
0000 0000 stack pointer, and CPU SFRs)
NOTES:
1. After a reset, the device fetches its first instruction from 2080H.
2. The content or function of these locations may change in future device revisions, in which case a pro-
gram that relies on a location in this range might not function properly.
4.1.3

Program Memory

Program memory occupies a memory partition beginning at 2080H. (See Table 4-1 for the ending
address for each device.) This entire partition is available for storing executable code and data.
The EA# signal controls access to program memory. Accesses to this address range are directed
to internal memory if EA# is held high and to external memory if EA# is held low. For devices
without internal nonvolatile memory, the EA# signal must be tied low. EA# is latched at reset.
We recommend that you write FFH (the opcode for the RST instruction) to
unused program memory locations. This causes a device reset if a program
unintentionally begins to execute in unused memory.
4-2
Table 4-1. Memory Map
Description
NOTE
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Addressing Modes
Indirect or indexed
Indirect or indexed
Indirect or indexed
Indirect or indexed
Indirect, indexed, or
windowed direct
Indirect or indexed
Indirect, indexed, or
windowed direct
Direct, indirect, or indexed