Nec switch Manuel d'utilisateur télécharger pdf (Page 175)

CHAPTER 11 INTERRUPT FUNCTIONS

User’s Manual U12978EJ3V0UD

175

11.4.3 Multiplexed interrupt servicing

Servicing in which another interrupt is acknowledged while an interrupt is being processed is called multiplexed

interrupt servicing.

Multiplexed interrupt is not performed unless interrupt requests are enabled (IE = 1) (except the non-maskable

interrupt request). Other interrupt requests are disabled (IE = 0) as soon as an interrupt request is acknowledged.

Therefore, it is necessary to set (1) the IE flag to realize the interrupt enable state using the EI instruction during

interrupt request servicing in order to enable multiplexed interrupt servicing.

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Nec switch Manuel d'utilisateur Page 175