IP2022 User’s Manual—Instruction Set Architecture www.ubicom.com 159 IREAD Read External/Program Memory Operation: DATAH || DATAL = (ADDRX || ADDRH || ADDRL) Bits affected: None Opcode: 0000 0000 0001 1001 Description: This   instruction   transfers   data   from   external
memory, program flash memory, or program RAM
to data memory. The                                                                                     24-bit
ADDRX/ADDRH/ADDRL   register   specifies   the
address of a 16-bit word which is loaded into the
DATAH/DATAL     register.     The     instruction     is
blocking (i.e. no other instructions may execute
until it completes) when it is used to read program
RAM or when it is executed from program flash
memory  to  read  program  flash  memory.    The
instruction is non-blocking when it is used to read
external  memory  or  when  it  is  executed  from
program RAM to read program flash memory. Cycles: 4 (blocking)/1 (non-blocking)