Renesas R8C/Tiny Series Software Manual page 49

Chapter 2 Addressing Modes
FB relative
The bit that is as much away from bit 0 at
bit,base:8[FB]
the address indicated by frame base
register (FB) plus the value indicated by
base (added including the sign bit) as the
number of bits indicated by bit is the
object to be operated on.
However, if the address of the bit to be
operated on exceeds 00000
the bits above bit 17 are ignored and the
address returns to 00000
The address range that can be specified
by bit,base: 8 is 16 bytes toward lower
addresses or 15 bytes toward higher
addresses from the frame base register
(FB) value.
FLG direct
The specified flag is the object to
U
be operated on.
I
O This addressing can be used in
FCLR and FSET instructions.
B
S
Z
D
C
If the base value is negative
-0FFFF ,
16 16
Register
or 0FFFF .
16 16
FB
If the base value is positive
FLG
32
2.5 Bit Instruction Addressing
base
address address
base
Register
b7
U I O B S
Memory
(Bit position)
Bit position
b0
Z D C