SH7101 Datasheet, PDF (49/486 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

2. CPU
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
General registers
Register
R0 to R14
R15 (SP)
Control registers
SR
System registers
GBR
VBR
MACH, MACL, PR
PC
Initial Value
Undefined
Value of the stack pointer in the vector
address table
Bits I3 to I0 are 1111 (H'F), reserved bits
are 0, and other bits are undefined
Undefined
H'00000000
Undefined
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
Rev.2.00 Sep. 27, 2007 Page 15 of 448
REJ09B0394-0200