Dedicated Registers - Fujitsu F2MC-16LX Hardware Manual

2.4

Dedicated Registers

Dedicated registers are implemented in the CPU by dedicated hardware. The
application of these registers is restricted by the CPU architecture.
■ Dedicated Registers
Dedicated registers are implemented in the CPU by dedicated hardware. The application of
these registers is restricted by the CPU architecture.
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The F MC-16LX supports the following 13 dedicated registers:
❍ Accumulator (A=AH:AL)
Two 16-bit accumulators (can be used as a single accumulator containing a total of 32 bits).
❍ User stack pointer (USP)
A 16-bit pointer to the user stack area.
❍ System stack pointer (SSP)
A 16-bit pointer to the system stack area.
❍ Processor status (PS)
A 16-bit register indicating the system status.
❍ Program counter (PC)
16-bit register for the address at which the program is stored.
❍ Program bank register (PCB)
An 8-bit register indicating the PC space.
❍ Data bank register (DTB)
An 8-bit register indicating the DT space.
❍ User stack bank register (USB)
An 8-bit register indicating the user stack space.
❍ System stack bank register (SSB)
An 8-bit register indicating the system stack space.
❍ Additional data bank register (ADB)
An 8-bit register indicating the AD space.
❍ Direct page register (DPR)
An 8-bit register indicating the direct page.
2.4 Dedicated Registers
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