H8SSLASH2218 datasheet(93/750 Pages) RENESAS

部件名	H8S/2218

功能描述	16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

PDF	750 Pages

Scroll/Zoom	100%

制造商	RENESAS [Renesas Technology Corp]

网页	http://www.renesas.com

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Section 2 CPU

Rev.6.00 Jun. 03, 2008 Page 45 of 698

REJ09B0074-0600

2.5.2

Memory Data Formats

Figure 2.10 shows the data formats in memory. The H8S/2000 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.

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

size or longword size.

543210

MSB

LSB

MSB

LSB

Data Type

Address

1-bit data

Byte data

Word data

Address L

Address 2M

Address 2M+1

Longword data

Address 2N

Address 2N+1

Address 2N+2

Address 2N+3

Data Image

Figure 2.10 Memory Data Formats

2.6

Instruction Set

The H8S/2000 CPU has 65 types of instructions. The instructions are classified by function in

table 2.1.

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