Registers - Fujitsu MB90460 Series Hardware Manual

3.6

Registers

2
F MC-16LX registers are classified into internal dedicated CPU registers and built-in
RAM general-purpose registers.
■ Dedicated Registers and General-purpose Registers
Dedicated registers are dedicated hardware inside the CPU with limited use in the CPU architecture.
General-purpose registers exist together with RAM in the CPU address space. Just like dedicated registers,
general-purpose registers can be accessed without addressing. Just like ordinary memory, the user can
specify how the register is used. Figure 3.6-1 shows the location of the dedicated registers and general-
purpose registers in the device.
Figure 3.6-1 Dedicated Registers and General-purpose Registers
Dedicated register
Accumulator
User stack pointer
System stack pointer
Processor status
Program counter
Direct page register
Program bank register
Data bank register
User stack bank register
System stack bank register
Additional data bank register
CHAPTER 3 CPU
General-purpose
register
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