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Vector Base Register (VBR): The global base register (GBR) can be accessed only in privileged
mode. If a transition from reset state to exception handling state occurs, this register is referenced
as a base address. For details, refer to section 5, Exception Handling. At reset, the VBR is
initialized as H'00000000.
Figure 2.6 shows the control register configuration.
31
0
31
SPC
SSR
0
Save status register (SSR)
Save program counter (SPC)
31
0
31
VBR
GBR
0
Global base register (GBR)
Vector base register (VBR)
31
0
0 MD RB BL 0
Status register (SR)
T
S
0
0
I0
I1
I2
I3
Q
M
0
Figure 2.6 Control Register Configuration
2.4
Data Formats
2.4.1
Register Data Format
Register operands are always longwords (32 bits). When the memory operand is only a byte (8
bits) or a word (16 bits), it is sign-extended into a longword when loaded into a register.
31
0
Longword
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