HD6432351 datasheet(71/1025 Pages) RENESAS

Part #	HD6432351

Description	16-Bit Single-Chip Microcomputer

PDF	1025 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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71 / 1025 page

Section 2 CPU

Rev. 3.00 Sep 15, 2006 page 37 of 988

REJ09B0330-0300

2.5.2

Memory Data Formats

Figure 2.11 shows the data formats in memory. The CPU can access word data and longword data

in memory, but word or longword data must begin at an even address. If an attempt is made to

access word or longword data at an odd address, no address error occurs but the least significant

bit of the address is regarded as 0, so the access starts at the preceding address. This also applies to

instruction fetches.

654

MSB

LSB

MSB

LSB

MSB

LSB

Data Type

Data Format

1-bit data

Byte data

Word data

Longword data

Address

Address L

Address 2M

Address 2M + 1

Address 2N

Address 2N + 1

Address 2N + 2

Address 2N + 3

Figure 2.11 Memory Data Formats

When ER7 is used as an address register to access the stack, the operand size should be word size

or longword size.

HD6432351 Datasheet(PDF) 71 Page - Renesas Technology Corp