General-Purpose Registers (Register Bank) - Fujitsu F2MC-16LX Hardware Manual

16-bit microcontroller mb90330 series

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CHAPTER 2 CPU

General-purpose Registers (Register Bank)

Functions of general-purpose registers (register bank) are described here.

General-purpose Registers (Register Bank)

The register bank consisting of 8 words can be used as the general-purpose register for arithmetic

operations of the byte register (R0 to R7), the word register (RW0 to RW7), and the long word register

(RL0 to RL3). In addition, the register bank can be used as the instruction pointer. Table 2.3-2 shows the

functions of each register and Figure 2.3-12 shows the relations with each register.

The register bank value is not initialized by the reset as same as the normal RAM area and the status before

the reset is maintained.

However, power becomes irregular when it is on.

Table 2.3-2 Functions of Each Register

Used as operands for various instructions

Note: The R0 is also used as the barrel shift counter or the normalization instruction counter.

Used as pointers and operands for various instructions

Note: RW0 can also be used as the string instruction counter.

Used as long pointers and operands for various instructions

Figure 2.3-12 Relations with Each Register