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HD64F2138 Datasheet(PDF) 93 Page - Renesas Technology Corp |
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HD64F2138 Datasheet(HTML) 93 Page - Renesas Technology Corp |
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93 / 1061 page  Section 2 CPU Rev. 4.00 Jun 06, 2006 page 39 of 1004 REJ09B0301-0400 2.5 Data Formats The 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 Figure 2.10 shows the data formats in general registers. 76543210 Don’t care 70 Don’t care 76543210 43 70 70 Don’t care Upper digit Lower digit LSB MSB LSB Data Type General Register Data Format 1-bit data 1-bit data 4-bit BCD data 4-bit BCD data Byte data Byte data RnH RnL RnH RnL RnH RnL MSB Don’t care Upper digit Lower digit 43 70 Don’t care 70 Don’t care 70 Figure 2.10 General Register Data Formats |
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