Zilog Z08470 Uživatelský manuál stáhnout pdf (Strana 298)

100

101

Z80 Instruction Set UM008007-0715

286

Z80 CPU

User Manual

B generates an interrupt and is acknowledged. The interrupt enable out, IEO, of B goes

Low, blocking any lower priority devices from interrupting while B is being serviced.

Then A generates an interrupt, suspending service of B. The IEO of A goes Low, indicat-

ing that a higher priority device is being serviced. The A routine is completed and a RETI

is issued resetting the IEO of A, allowing the B routine to continue. A second RETI is

issued on completion of the B routine and the IE0 of B is reset (High), allowing lower-pri-

ority devices interrupt access.

IEI

IEO

IEI

IEO

INT

1 2 ... 293 294 295 296 297 298 299 300 301 302 303 ... 325 326

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