In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

Rsadeika,

the RESET is not just a programming convenience tool - it is an important directive.

When any SX starts program execution after a reset or power-on, it reads and executes the instruction located at the highest available program memory first, so this address should always contain a JMP instruction sending program execution to a point where YOU want to start it.

With a directive like

RESET Main

the assembler automatically generates a JMP <address of main> for the highest location in program memory.  Note that after power-on/reset, the high page select bits in the STATUS register are automatically cleared, i.e. PAGE 0 is automatically selected. This is why the start of the main program can only be located in the first page of program memory.

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