Epson S1C63558 - Manual (Page 133)

S1C63558 TECHNICAL MANUAL EPSON 123
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Telephone Function)
t
PS
t
TD
"0"
t
TD :
t
TIP
:
t
MH :
t
PS :
Tone duration time
Tone inter-digit pause time
Mute hold time
Pause time
HSON
(FF18H•D3)
Data bus
Write to TCD
(FF17H)
DP
XRMUTE(R11)
XTMUTE(R10)
Interrupt
request
2 3 Pause
Write to PAUSE
(FF14H•D1)
TONE
t
MH
t
MH
t
TIP
t
TIP
t
TD
"0"
"0"
"0"
"0"
"1"
"1"
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.