User guide

SmartBook for Renesas R8C/Tiny Microcontrollers

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There is a complementary instruction, Load Context, LDCTX, also available to

complete the picture.

An example using STCTX and LDCTX instructions.

3.15 String Store (SSTR):

This instruction stores the contents of R0 in block of memory area addressed by

A1. The block length is defined by R3. This instruction takes 2 bytes of program

code.

3.16 Extend Sign (EXTS):

This extends the sign of the data in 16 or 32 bits using two to four bytes of code.

The operation destination may be either register or the memory location.

3.17 Instruction Format:

R8C/Tiny architecture has the facility to define

the instructions in different formats to serve many

purposes. The instructions can be defined in

four different formats: Generic, Short, Quick

and Zero formats. Of these, the generic format

EXTS extends the

sign of the data in 16 or

32 bits

using two

to four bytes

of code.