hd66100 Renesas Electronics Corporation., hd66100 Datasheet - Page 30
hd66100
Manufacturer Part Number
hd66100
Description
H8/3867 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.HD66100.pdf
(495 pages)
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2.2
2.2.1
All the general registers can be used as both data registers and address registers.
When used as data registers, they can be accessed as 16-bit registers (R0 to R7), or the high bytes
(R0H to R7H) and low bytes (R0L to R7L) can be accessed separately as 8-bit registers.
When used as address registers, the general registers are accessed as 16-bit registers (R0 to R7).
R7 also functions as the stack pointer (SP), used implicitly by hardware in exception processing
and subroutine calls. When it functions as the stack pointer, as indicated in figure 2.2, SP (R7)
points to the top of the stack.
2.2.2
The CPU control registers include a 16-bit program counter (PC) and an 8-bit condition code
register (CCR).
Program Counter (PC): This 16-bit register indicates the address of the next instruction the CPU
will execute. All instructions are fetched 16 bits (1 word) at a time, so the least significant bit of
the PC is ignored (always regarded as 0).
Condition Code Register (CCR): This 8-bit register contains internal status information,
including the interrupt mask bit (I) and half-carry (H), negative (N), zero (Z), overflow (V), and
carry (C) flags. These bits can be read and written by software (using the LDC, STC, ANDC,
ORC, and XORC instructions). The N, Z, V, and C flags are used as branching conditions for
conditional branching (Bcc) instructions.
SP (R7)
Register Descriptions
General Registers
Control Registers
Figure 2.2 Stack Pointer
Lower address side [H'0000]
Upper address side [H'FFFF]
Unused area
Stack area
15
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