Fujitsu F2MC-16LX Hardware Manual page 49

16-bit microcontroller mb90330 series

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General-purpose Register

MC-16LX general-purpose registers are present at addresses 000180

configuration) of main memory. The register bank pointer (RP) indicates the part in use as current register

bank out of the above mentioned address. In each bank, three kinds of registers shown next exist. They are

dependent each other as shown in Figure 2.3-2.

• R0 to R7:General-purpose register of 8-bit

• RW0 to RW7:General-purpose register of 16-bit

• RL0 to RL3:General-purpose register of 32-bit

Figure 2.3-2 shows the configuration of the general-purpose register.

The relationship between the upper and lower bytes of byte register and word register can be expressed by

the equation, RW(i + 4) = RW(i × 2 + 1) × 256 + R(i × 2) [i = 0 to 3] while the relation between the upper

and lower bytes of Rli can be expressed by the equation, RW(i) = RW(i × 2 + 1) × 65536 + RW(i × 2) [i =

Figure 2.3-1 Configuration of Dedicated Registers

Figure 2.3-2 Configuration of General-purpose Register

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 2 CPU