Samsung 8-Bit Manual do Utilizador Página 117

  • Descarregar
  • Adicionar aos meus manuais
  • Imprimir
  • Página
    / 462
  • Índice
  • MARCADORES
  • Avaliado. / 5. Com base em avaliações de clientes
Vista de página 116
S3C9228/P9228 SAM88RCRI INSTRUCTION SET
6-21
EI Enable Interrupts
EI
Operation: SYM (2) ¨ 1
An EI instruction sets bit 2 of the system mode register, SYM.2 to "1". This allows interrupts to be
serviced as they occur. If an interrupt's pending bit was set while interrupt processing was
disabled (by executing a DI instruction), it will be serviced when you execute the EI instruction.
Flags: No flags are affected.
Format:
Bytes Cycles Opcode
(Hex)
opc 1 4 9F
Example: Given: SYM = 00H:
EI
If the SYM register contains the value 00H, that is, if interrupts are currently disabled, the
statement "EI" sets the SYM register to 04H, enabling all interrupts (SYM.2 is the enable bit for
global interrupt processing).
Vista de página 116
1 2 ... 112 113 114 115 116 117 118 119 120 121 122 ... 461 462

Comentários a estes Manuais

Sem comentários