General Registers; Configuration - NEC uPD784038 Series User Manual

16-bit single-chip microcontrollers

Table of Contents

3.8 GENERAL REGISTERS

There are sixteen 8-bit general-purpose registers, and two 8-bit general-purpose registers can be used together as a 16-bit

general-purpose register. In addition, four of the 16-bit general-purpose registers can be combined with an 8-bit register for

address extension, and used as 24-bit address specification registers.

General-purpose registers other than the V, U, T, and W registers for address extension are mapped onto internal RAM.

These register sets are provided in 8 banks, and can be switched by means of software or the context switching function.

Upon RESET input, register bank 0 is selected. The register bank used during program execution can be checked by reading

the register bank selection flag (RBS0, RBS1, RBS2) in the PSW.

Remark Absolute names are shown in parentheses.

CHAPTER 3 CPU ARCHITECTURE

Figure 3-13 General-Purpose Register Format

User's Manual U11316EJ4V1UD