Ibm uPD78082 Uživatelský manuál stáhnout pdf (Strana 219)

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CHAPTER 13 STANDBY FUNCTION

HALT

Instruction

Wait

Standby

Release Signal

Operating

Mode

Clock

HALT Mode Wait

Oscillation

Operating Mode

(2) HALT mode clear

The HALT mode can be cleared with the following three types of sources.

(a) Clear upon unmasked interrupt request

An unmasked interrupt request is used to clear the HALT mode. If interrupt acknowledge is enabled,

vectored interrupt service is carried out. If disabled, the next address instruction is executed.

Figure 13-2. HALT Mode Clear upon Interrupt Generation

Remarks 1. The broken line indicates the case when the interrupt request which has cleared the standby

status is acknowledged.

2. Wait time will be as follows:

• When vectored interrupt service is carried out: 8 to 9 clocks

• When vectored interrupt service is not carried out: 2 to 3 clocks

(b) Clear upon non-maskable interrupt request

The HALT mode is cleared and vectored interrupt service is carried out whether interrupt acknowledge

is enabled or disabled.

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Ibm uPD78082 Uživatelský manuál Strana 219