Renesas H8S/2111B Manuel d'utilisateur Page 59

  • Télécharger
  • Ajouter à mon manuel
  • Imprimer
  • Page
    / 582
  • Table des matières
  • MARQUE LIVRES
  • Noté. / 5. Basé sur avis des utilisateurs
Vue de la page 58
Rev. 1.00, 05/04, page 25 of 544
Bit Bit Name
Initial
Value R/W Description
0 C Undefined R/W Carry Flag
Set to 1 when a carry occurs, and cleared to 0
otherwise. Used by
Add instructions, to indicate a carry
Subtract instructions, to indicate a borrow
Shift and rotate instructions, to indicate a carry
The carry flag is also used as a bit accumulator by bit
manipulation instructions.
2.4.5 Initial Register Values
The program counter (PC) among CPU internal registers is initialized when reset exception
handling loads a start address from a vector table. The trace (T) bit in EXR is cleared to 0, and the
interrupt mask (I) bits in CCR and EXR are set to 1. The other CCR bits and the general registers
are not initialized. Note that the stack pointer (ER7) is undefined. The stack pointer should
therefore be initialized by an MOV.L instruction executed immediately after a reset.
Vue de la page 58
1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 581 582

Commentaires sur ces manuels

Pas de commentaire