Z380 View Datasheet(PDF) - Zilog

Part Name

Description

Manufacturer

Z380

MICROPROCESSOR

Zilog 

ZILOG

MICROPROCESSOR

Standby Mode Exit With External Interrupts

Standby mode can be exited by asserting input /NMI.

Asserting the maskable interrupt inputs /INT3-/INT0 may

also exit standby mode, if the global interrupt flag IEF1 was

previously enabled at logic 1, and for those requests

individually enabled, as indicated in the Interrupt Enable

Register.

When exit conditions are met, /STNBY goes to logic 1,

allowing the external crystal oscillator that drives the Z380

MPU’s CLK input to restart.

BUSCLK

The Z380 MPU’s internal warm-up counter proceeds to

count, for a duration long enough for the oscillator to

stabilize, as selected by the WM bits in the Standby Mode

Control Register. When the counter reaches its end-count,

clocking resumes within the Z380 MPU, as well as at the

BUSCLK and IOCLK outputs. The Z380 MPU performs an

interrupt acknowledge procedure appropriate to the inter-

rupt request that initiated the standby mode exit.

Appropriate

Acknowledge

IOCLK

/STNBY

/NMI

/INT3,2,1,0

ADDRESS

FFFFFFFFH

Figure 55. Standby Mode Exit with External Interrupts Timing

PS010001-0301

Share Link: