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UPD703100 Datasheet(PDF) 28 Page - NEC |
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UPD703100 Datasheet(HTML) 28 Page - NEC |
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28 / 185 page  User’s Manual U12197EJ6V0UM 28 CHAPTER 3 DATA TYPES 3.1 Data Format The V850 Series supports the following data types. • Integer (8, 16, 32 bits) • Unsigned integer (8, 16, 32 bits) • Bit 3.1.1 Data type and addressing The V850 Series supports three types of data lengths: word (32 bits), halfword (16 bits), and byte (8 bits). Byte 0 of any data is always the least significant byte (this is called little endian) and is shown at the rightmost position in figures throughout this manual. The following paragraphs describe the data format where data of a fixed length is in the memory. (1) Byte (BYTE) A byte is 8-bit contiguous data that starts from any byte boundary Note. Each bit is assigned a number from 0 to 7. The LSB (Least Significant Bit) is bit 0 and the MSB (Most Significant Bit) is bit 7. A byte is specified by its address A. Data 0 7 Address A (2) Halfword (HALF-WORD) A halfword is 2 byte (16-bit) contiguous data that starts from any halfword boundary Note. Each bit is assigned a number from 0 to 15. The LSB is bit 0 and the MSB is bit 15. A halfword is specified by its address A (with the lowest bit fixed to 0 when misalign access is disabled) Note, and occupies 2 bytes, A and A+1. Data 0 7 Address A 8 15 A+1 |
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