Fujitsu F2MC-16LX Hardware Manual page 44

Mb90470 series 16-bit microcontroller

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Table of Contents

CHAPTER 2 CPU

I General-purpose register

MC-16LX general-purpose register resides on the main memory addresses: 000180

of addresses are currently used for register banks. Each bank has the three types of registers

listed below. They are dependent on one another, as shown in Figure 2.3-2 "Configuration of

general-purpose register".

R0 to R7: 8-bit general-purpose register

RW0 to RW7: 16-bit general-purpose register

RL0 to RL3: 32-bit general-purpose register

Figure 2.3-2 "Configuration of general-purpose register" shows the configuration of a general-

purpose register.

The relationship between upper and lower bytes in a byte register and word register is

represented with the following formula: RW(i + 4) = RW(i x 2 + 1) x 256 + R(i x 2) [i = 0 to 3].

The relationship of upper and lower bytes in Rli is represented with the following formula: RW(i)

= RW(i x 2 + 1) x 65536 + RW(i x 2) [i = 0 to 3].

(maximum configuration). It uses a register bank register (RP) to indicate which part

Figure 2.3-2 Configuration of general-purpose register