[s1mp3-dev] Actions documents arrive

[Wladston Viana F Filho]

On 6/9/06, Jeroen Domburg <jeroen at sprite.student.utwente.nl> wrote:
>
> Could you do me a favour and look up the meaning of the Z80 instruction
> 'di'?



>From zilog manual. This manual is VERY good for people wishing to learn Z80,
imo.

----

Operation: IFF ← 0

Op Code: DI
(1 1 1 1 0 0 1 1) F3

Description: DI disables the maskable interrupt by resetting the interrupt
enable flipflops
(IFF1 and IFF2). Note that this instruction disables the maskable
interrupt during its execution.

M cycles: 1
T States: 4
4MHz E.T.:1.00

Condition Bits Affected: None

Example: When the CPU executes the instruction DI the maskable interrupt is
disabled until it is subsequently re-enabled by an EI instruction. The CPU
does not respond to an Interrupt Request (INT) signal.




-- 
Wladston Viana Ferreira Filho
Belo Horizonte - MG, Brasil
Visit the project: s1mp3.org
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