HD64F3687GHV Datasheet, PDF (47/566 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 2 CPU
2.2.1 General Registers
The H8/300H CPU has eight 32-bit general registers. These general registers are all functionally
identical and can be used as both address registers and data registers. The general registers are
available for use as 32-, 16-, and 8-bit data registers. Figure 2.3 illustrates the usage of the general
registers. 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 are divided 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 are divided into 8-bit 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.
The usage of each register can be selected independently.
• Address registers
• 32-bit registers
ER registers
(ER0 to ER7)
• 16-bit registers
E registers (extended registers)
(E0 to E7)
R registers
(R0 to R7)
• 8-bit registers
RH registers
(R0H to R7H)
RL registers
(R0L to R7L)
Figure 2.3 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 2.4 shows the
relationship between the stack pointer and the stack area.
Rev. 3.00 Sep. 10, 2007 Page 13 of 528
REJ09B0216-0300