MC68HC908JL8 MOTOROLA [Motorola, Inc], MC68HC908JL8 Datasheet - Page 69

• Manufacturer Part Number: MC68HC908JL8
• Description: Motorola reserves the right to make changes without further notice to any products herein
• Manufacturer: MOTOROLA [Motorola, Inc]

6.4.4 Program Counter
MC68HC908JL8
MOTOROLA
NOTE:
—
Rev. 2.0
The location of the stack is arbitrary and may be relocated anywhere in
RAM. Moving the SP out of page 0 ($0000 to $00FF) frees direct
address (page 0) space. For correct operation, the stack pointer must
point only to RAM locations.
The program counter is a 16-bit register that contains the address of the
next instruction or operand to be fetched.
Normally, 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.
During reset, the program counter is loaded with the reset vector
address located at $FFFE and $FFFF. The vector address is the
address of the first instruction to be executed after exiting the reset state.
Reset:
Reset:
Read:
Read:
Write:
Write:
Freescale Semiconductor, Inc.
For More Information On This Product,
Bit
Bit
15
15
0
14
14
Central Processor Unit (CPU)
0
Go to: www.freescale.com
13
13
0
Figure 6-5. Program Counter (PC)
Figure 6-4. Stack Pointer (SP)
12
12
0
11
11
0
Loaded with Vector from $FFFE and $FFFF
10
10
0
9
9
0
8
8
0
7
7
1
6
6
1
Central Processor Unit (CPU)
5
5
1
4
4
1
3
3
1
CPU Registers
Technical Data
2
2
1
1
1
1
Bit
Bit
0
0
1
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