SX Embedded Controller Instruction

IREAD - Used to read 12-bit instruction memory. The contents of address (MODE:W) is copied into MODE:W. In other words:

• First store the high four bits of the address to be read into the MODE register and the
• low eight bits of the address into the W register.
• Then, execute the IREAD instruction

After the IREAD instruction is executed, the high four bits of the addressed location are in MODE and the low eight bits are in W.

by Loren Blaney via Richard Ottosen

Also:

• SX Microcontroller Memory Method - Table lookups

Contrary to some pages of the users guide and the datasheet, IREAD has been confirmed (by Guenther Daubach) to take 4 cycles in turbo mode. +