Data Formats - Hitachi H8/329 Series Hardware Manual

3.4 Data Formats

The H8/300 CPU can process 1-bit data, 4-bit (BCD) data, 8-bit (byte) data, and 16-bit (word)
data.
• Bit manipulation instructions operate on 1-bit data specified as bit n (n = 0, 1, 2, ..., 7) in a byte
operand.
• All arithmetic and logic instructions except ADDS and SUBS can operate on byte data.
• The DAA and DAS instruction perform decimal arithmetic adjustments on byte data in packed
BCD form. Each nibble of the byte is treated as a decimal digit.
• The MOV.W, ADD.W, SUB.W, CMP.W, ADDS, SUBS, MULXU (8 bits × 8 bits), and DIVXU
(16 bits ÷ 8 bits) instructions operate on word data.
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