H8/3004 Просмотр технического описания (PDF) - Renesas Electronics

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H8/3004

Microcomputer

Renesas Electronics 

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.

Data Type

1-bit data

1-bit data

4-bit BCD data

4-bit BCD data

Byte data

Byte data

General

Register

RnH

RnL

RnH

RnL

RnH

RnL

Data Format

7

0

76543210

Don’t care

Don’t care

7

0

76543210

7

43

0

Upper digit Lower digit

Don’t care

Don’t care

7 43 0

Upper digit Lower digit

7

0

Don’t care

MSB

LSB

7

0

Don’t care

MSB

LSB

Figure 2-6 General Register Data Formats (1)

21

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