SP
- Address: 0x81.
- Size: 8-bit.
- Byte addressable.
- Contains the address of the data item on top of the stack.
- Used by subroutine call and return instructions.
- Stack, in user space of internal RAM, grows upward; the SP is incremented before pushing and decremented after popping a value.
- By default, SP will be initialized to 07H.
- User can initialize SP to desired location.
- Depending on the initial value of the SP, 8051 stack can have different sizes.
Related topics:
8051 Registers | 8051 Program Counter | 8051 R Registers | 8051 SFR | 8051 P Registers | 8051 Stack | 8051 Data Pointer | 8051 PCON Register | 8051 TCON Register | 8051 TMOD Register | 8051 Timer Registers | 8051 SCON Register | 8051 SBUF Register | 8051 IE Register | 8051 IP Register | 8051 PSW Register | 8051 A Register | 8051 B Register
List of topics: 8051
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