HD6437101 RENESAS [Renesas Technology Corp], HD6437101 Datasheet - Page 52

• Manufacturer Part Number: HD6437101
• Description: 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 2 CPU
Global Base Register (GBR): Indicates the base address of the indirect GBR addressing mode.
The indirect GBR addressing mode is used in data transfer for on-chip peripheral modules register
areas and in logic operations.
Vector Base Register (VBR): Indicates the base address of the exception processing vector area.
2.2.3
System registers consist of four 32-bit registers: high and low multiply and accumulate registers
(MACH and MACL), the procedure register (PR), and the program counter (PC).
Multiply-and-Accumulate Registers (MAC): Registers to store the results of multiply-and-
accumulate operations.
Procedure Register (PR): Registers to store the return address from a subroutine procedure.
Program Counter (PC): Registers to indicate the sum of current instruction addresses and four,
that is, the address of the second instruction after the current instruction.
2.2.4
Table 2.1 lists the values of the registers after reset.
Table 2.1
Rev.1.00 Sep. 18, 2008 Page 18 of 522
REJ09B0069-0100
Classification
General registers
Control registers
System registers
System Registers
Initial Values of Registers
Initial Values of Registers
Register
R0 to R14
R15 (SP)
SR
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