Renesas R8C/17 Guía de usuario descargar pdf (Pagina 43)

SmartBook for Renesas R8C/Tiny Microcontrollers

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These registers can be used individually or can be combined to form bigger size

of data. The absolute mode gives direct address in the range 00000H to 0FFFFH

using 16 bits. When using address register indirect, the contents of the address

registers, A0 and A1 can be treated as the effective address required for the

operations.

In other relative modes, a displacement data plays a role in calculating the effective

address of the memory location. When using address register relative mode, the

displacement data using either eight bits or 16 bits is added with any of the address

registers to form the effective address of the target memory location. During this

calculation, sign bits are ignored and when the result exceeds 16 bits, all the bits

above 16 are ignored and the resulted address is reset with 00000H. Likewise, in

the SB relative mode, the displacement data is added with the Static base register

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Renesas R8C/17 Guía de usuario Pagina 43