HD64338024 datasheet(73/697 Pages) RENESAS

73 / 697 page

Section 2 CPU

Rev. 7.00 Mar 10, 2005 page 31 of 652

REJ09B0042-0700

2.3.2

Memory Data Formats

Figure 2.4 indicates the data formats in memory. The H8/300L CPU can access word data stored

in memory (MOV.W instruction), but the word data must always begin at an even address. If word

data starting at an odd address is accessed, the least significant bit of the address is regarded as 0,

and the word data starting at the preceding address is accessed. The same applies to instruction

codes.

Data Format

76543210

Address

Data Type

Address n

MSB

LSB

MSB

LSB

Upper 8 bits

Lower 8 bits

MSB

LSB

CCR

CCR*

MSB

LSB

MSB

LSB

Address n

Even address

Odd address

Even address

Odd address

Even address

Odd address

1-bit data

Byte data

Word data

Byte data (CCR) on stack

Word data on stack

[Legend]

CCR: Condition code register

Note:

* Ignored on return

Figure 2.4 Memory Data Formats

When the stack is accessed using R7 as an address register, word access should always be

performed. When the CCR is pushed on the stack, two identical copies of the CCR are pushed to

make a complete word. When they are restored, the lower byte is ignored.

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