CPU Register - DF Control Flag

Z80 Registers

CPU Register - DF Control Flag

About

The direction flag (DF, located in bit 10 of the EFLAGS register) controls string instructions.

Management

Set

Setting the DF flag causes the string instructions to auto-decrement (to process strings from high addresses to low addresses).

Clear

Clearing the DF flag causes the string instructions to auto-increment (process strings from low addresses to high addresses). The STD and CLD instructions set and clear the DF flag, respectively.





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Eflags Registers
CPU Register - Eflag

The 32-bit EFLAGS register contains: a group of status flags, a control flag (DF), and a group of system flags. When suspending a task, the processor automatically saves the state of...



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Task Runner