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SX Embedded Controller Instruction

RETIW lit

Description: Return from interrupt, compensate RTCC
Operation: PC, W, FSR and status = shadow register; RTCC += lit
Flags affected: none
Registers affected: RTCC PC
Sources referenced: lit
Cycles: 1
Opcode:
Details: SX Users Manual page # 115
Microchip PIC syntax:
Notes:

RETIW - Same as RETI but adds the contents of W to RTCC without affecting the prescaler. This provides a periodic interrupt that can be adjusted by 256 steps (minus the time it takes to execute the interrupt routine)

by Loren Blaney via Richard Ottosen

The RETIW instruction ADDS W to RTCC, not subtracts it as stated in Table 16-1 in SX Datasheet page 33

See also:

See:

file: /Techref/scenix/inst/retiw.htm, 2KB, , updated: 2018/11/6 11:52, local time: 2024/12/25 08:29,
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