MC68HC05K0 Datasheet, PDF (39/154 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Central Processor Unit (CPU)
CPU Registers
3.3.4 Program Counter
The program counter (PC) shown in Figure 3-5 is a 16-bit register that
contains the address of the next instruction or operand to be fetched.
The six most significant bits of the program counter are ignored internally
and appear as 000000 when stacked.
Normally, the address in the program counter automatically increments
to the next sequential memory location every time an instruction or
operand is fetched. Jump, branch, and interrupt operations load the
program counter with an address other than that of the next sequential
location.
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Bit 0
Read:
000000
Write:
Reset:
Loaded with vector from $03FE and $03FF
Figure 3-5. Program Counter
MC68HC05K0 • MC68HC05K1 — Rev. 2.0
Central Processor Unit (CPU)
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Technical Data