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SH7101 データシート(PDF) 49 Page - Renesas Technology Corp |
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SH7101 データシート(HTML) 49 Page - Renesas Technology Corp |
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49 / 486 page  2. CPU Rev.2.00 Sep. 27, 2007 Page 15 of 448 REJ09B0394-0200 2.2.4 Initial Values of Registers Table 2.1 lists the values of the registers after reset. Table 2.1 Initial Values of Registers Classification Register Initial Value R0 to R14 Undefined General registers R15 (SP) Value of the stack pointer in the vector address table SR Bits I3 to I0 are 1111 (H'F), reserved bits are 0, and other bits are undefined GBR Undefined Control registers VBR H'00000000 System registers MACH, MACL, PR Undefined PC Value of the program counter in the vector address table 2.3 Data Formats 2.3.1 Data Format in Registers Register operands are always longwords (32 bits). If the size of memory operand is a byte (8 bits) or a word (16 bits), it is changed into a longword by expanding the sign-part when loaded into a register. 31 0 Longword Figure 2.2 Data Format in Registers |
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