CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Telephone Function)

HSON

"0"

 

 

(FF18H•D3)

 

 

 

Data bus

2

Pause

3

 

Write to TCD

"0"

 

 

(FF17H)

 

 

 

Write to PAUSE

"0"

 

 

(FF14H•D1)

 

 

 

DP

"0"

 

 

 

tTD

 

tTD

TONE

"0"

 

 

 

tTIP

tPS

tTIP

XRMUTE(R11)

"1"

 

 

XTMUTE(R10)

tMH

 

tMH

"1"

 

 

Interrupt request

tTD: Tone duration time

tTIP: Tone inter-digit pause time

tMH: Mute hold time

tPS: Pause time

Fig. 4.14.6.1(b) Pause execution timing chart in tone mode

PAUSE is a write-only bit and is used as the trigger for a pause insertion.

When the pause time that is set to the PTS register has passed from the writing of the PAUSE bit, an interrupt occurs. At the same time the PAUSE bit is automatically cleared to "0" by the interrupt. Thus the pause function requires start control only.

The pause function uses the same interrupt system as the dialing completion. Therefore, the interrupt factor flag ID must be reset before executing the pause function.

S1C63558 TECHNICAL MANUAL

EPSON

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