HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 46
HD6417034B
Manufacturer Part Number
HD6417034B
Description
32-Bit RISC Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417034B.pdf
(687 pages)
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Section 2 CPU
2.2
2.2.1
Register operands are always longwords (32 bits). When the memory operand is only a byte (8
bits) or a word (16 bits), it is sign-extended into a longword when stored into a register (figure
2.4).
2.2.2
Memory data formats are classified into bytes, words, and longwords. Byte data can be accessed
from any address, but an address error will occur if an attempt is made to access word data starting
from an address other than 2n or longword data starting from an address other than 4n. In such
cases, the data accessed cannot be guaranteed. The hardware stack area, which is referred to by the
hardware stack pointer (SP, R15), uses only longword data starting from address 4n because this
area stores the program counter and status register (figure 2.5).
Rev. 7.00 Jan 31, 2006 page 20 of 658
REJ09B0272-0700
Data Formats
Data Format in Registers
Data Format in Memory
Address 2n
Address 4n
31
Figure 2.4 Data Format in Registers
Figure 2.5 Data Format in Memory
Address m
31
7
15
31
Byte
Word
0
Address m + 1
Longword
23
7
Byte
Longword
0
0
Address m + 2
15
7
15
Byte
Word
0
Address m + 3
7
7
0
Byte
0
0
0
0
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