H8SLASH3008 datasheet(68/686 Pages) RENESAS

Part #	H8/3008

Description	Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

PDF	686 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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2. CPU

Rev.4.00 Aug. 20, 2007 Page 24 of 638

REJ09B0395-0400

2.5

Data Formats

The H8/300H CPU can process 1-bit, 4-bit (BCD), 8-bit (byte), 16-bit (word), and 32-bit

(longword) data. Bit-manipulation instructions operate on 1-bit data by accessing bit n (n = 0, 1,

2, …, 7) of byte operand data. The DAA and DAS decimal-adjust instructions treat byte data as

two digits of 4-bit BCD data.

2.5.1

General Register Data Formats

Figures 2.6 and 2.7 show the data formats in general registers.

RnH

RnL

RnH

RnL

RnH

RnL

1-bit data

4-bit BCD data

Byte data

65 4 3 2 1 0

Don't care

7 6 5 4 32 10

Don't care

Lower digit

Upper digit

Lower digit

Upper digit

Don't care

MSB

LSB

Don't care

MSB

LSB

Data Type

Data Format

General

Legend:

RnH: General register RH

RnL: General register RL

MSB: Most significant bit

LSB: Least significant bit

Figure 2.6 General Register Data Formats (1)

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