Zilog Z80180 Manuel d'utilisateur Page 46

  • Télécharger
  • Ajouter à mon manuel
  • Imprimer
  • Page
    / 326
  • Table des matières
  • MARQUE LIVRES
  • Noté. / 5. Basé sur avis des utilisateurs
Vue de la page 45
Z8018x
Family MPU User Manual
UM005003-0703
31
Also, the WAIT input is ignored during RESET. For example, if RESET
is detected while the Z8X180 is in a Wait State (TW), the Wait Stated
cycle in progress is aborted, and the RESET sequence initiated. Thus,
RESET
has higher priority than WAIT.
HALT and Low Power Operation Modes (Z80180-Class
Processors Only)
The Z80180 can operate in two different modes:
HALT mode
IOSTOP mode
and two low-power operation modes:
SLEEP
SYSTEM STOP
In all operating modes, the basic CPU clock (XTAL, EXTAL) must
remain active.
HALT Mode
HALT mode is entered by execution of the HALT instruction (Op Code
76H) and has the following characteristics:
The internal CPU clock remains active
All internal and external interrupts can be received
Bus exchange (BUSREQ and BUSACK) can occur
Dynamic RAM refresh cycle (RFSH) insertion continues at the
programmed interval
I/O operations (ASCI, CSI/O and PRT) continue
The DMAC can operate
Vue de la page 45
1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 325 326

Commentaires sur ces manuels

Pas de commentaire