Renesas R8C/Tiny Series Software Manual page 31

Chapter 1 Overview
(2) SB/FB relative bit specification
For SB/FB-based relative addressing, use bit 0 of the address that is the sum of the address set to
static base register (SB) or frame base register (FB) plus the address set to base as the reference (=
0), and set your desired bit position to bit.
(3) Address register indirect/relative bit specification
For address register-based indirect addressing, use bit 0 of address 00000
and set your desired bit position to address register (An).
For address register-based relative addressing, use bit 0 of the address set to base as the reference
(= 0) and set your desired bit position to address register (An).
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1.7 Data Types
as the reference (= 0)
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