HD6433682 ETC, HD6433682 Datasheet - Page 46
HD6433682
Manufacturer Part Number
HD6433682
Description
Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series
Manufacturer
ETC
Datasheet
1.HD6433682.pdf
(504 pages)
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HD6433682A45HV
Manufacturer:
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Manufacturer:
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2.2.1
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. When a general register is
used as a data register, it can be accessed as a 32-bit, 16-bit, or 8-bit register. 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 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 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.
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, 05/03, page 16 of 472
General Registers
• Address registers
• 32-bit registers
(ER0 to ER7)
ER registers
Figure 2.3 Usage of General Registers
E registers (extended registers)
• 16-bit registers
R registers
(E0 to E7)
(R0 to R7)
• 8-bit registers
(R0H to R7H)
(R0L to R7L)
RH registers
RL registers
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