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HD6432126R Datasheet(PDF) 61 Page - Renesas Technology Corp |
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HD6432126R Datasheet(HTML) 61 Page - Renesas Technology Corp |
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61 / 843 page  37 2.4.2 General Registers The CPU has eight 32-bit general registers. These general registers are all functionally alike and can be used as both address registers and data registers. When a general register is used as a data register, it can be accessed as a 32-bit, 16-bit, or 8-bit register. When the general registers are used as 32-bit registers or address registers, they are designated by the letters ER (ER0 to ER7). The ER registers divide into 16-bit general registers designated by the letters E (E0 to E7) and R (R0 to R7). These registers are functionally equivalent, providing a maximum of sixteen 16-bit registers. The E registers (E0 to E7) are also referred to as extended registers. The R registers divide into 8-bit general registers designated by the letters RH (R0H to R7H) and RL (R0L to R7L). These registers are functionally equivalent, providing a maximum of sixteen 8- bit registers. Figure 2.8 illustrates the usage of the general registers. The usage of each register can be selected independently. • Address registers • 32-bit registers • 16-bit registers • 8-bit registers ER registers (ER0 to ER7) E registers (extended registers) (E0 to E7) R registers (R0 to R7) RH registers (R0H to R7H) RL registers (R0L to R7L) Figure 2.8 Usage of General Registers General register ER7 has the function of stack pointer (SP) in addition to its general-register function, and is used implicitly in exception handling and subroutine calls. Figure 2.9 shows the stack. |
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