r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 57
r8a77850anbg
Manufacturer Part Number
r8a77850anbg
Description
Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R8A77850ANBG.pdf
(1692 pages)
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(DBR), which can only be accessed in privileged mode. Some bits of the status register (such as
the RB bit) can only be accessed in privileged mode.
(4)
System registers comprise the multiply-and-accumulate registers (MACH/MACL), the procedure
register (PR), and the program counter (PC). Access to these registers does not depend on the
processing mode.
(5)
There are thirty-two floating-point registers, FR0–FR15 and XF0–XF15. FR0–FR15 and XF0–
XF15 can be assigned to either of two banks (FPR0_BANK0–FPR15_BANK0 or FPR0_BANK1–
FPR15_BANK1).
FR0–FR15 can be used as the eight registers DR0/2/4/6/8/10/12/14 (double-precision floating-
point registers, or pair registers) or the four registers FV0/4/8/12 (register vectors), while XF0–
XF15 can be used as the eight registers XD0/2/4/6/8/10/12/14 (register pairs) or register matrix
XMTRX.
System registers related to the FPU comprise the floating-point communication register (FPUL)
and the floating-point status/control register (FPSCR). These registers are used for communication
between the FPU and the CPU, and the exception handling setting.
Register values after a reset are shown in table 2.1.
System Registers
Floating-Point Registers and System Registers Related to FPU
Rev.1.00 Jan. 10, 2008 Page 27 of 1658
2. Programming Model
REJ09B0261-0100
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