Silan
Semiconductorsꢀ
SC9302 Series
ꢀ
• Hand-free function execution
When HFO is low, a rising edge triggers the HFI, asserting the Hand-free function (HFO becomes high).
• Reset Hand-free function
When HFO is high, the Hand-free function is enabled and can be reset by:
* Off-hook
* Applying a rising edge to HFI
* Changing the HDO pin from low to high
10. HOLD-LINE FUNCTION OPERATION
• Hold-line function execution
When HDO is low, a falling edge triggers the
, asserting the Hold-line function (HDO becomes high). The
HDI
remains low when HDO is high.
XMUTE
• Reset Hold-line function
When HDO is high, the Hold-line function is enabled and can be reset by:
* Off-hook.
* Applying a falling edge to
.
HDI
* Changing the HFO pin from low to high.
• Hold-line function table
Current State
Input
Next State
HKS
HKS
An
An
An
L
HDI
HDO
HFO
HFI
HDO
HFO
H
H
H
H
L
L
X
L
H
L
H
L
An
L
H
X
L
X
L
L
L
L
L
L
L
L
L
An
L
X
X
X
L
H
H
L
An
An
An
H
L
An
L
L
L
H
L
L
H
X
X
An
An
H
L
X
L
H
H
An
L
X
An
H: Logic HIGH
X: Don’t care
: Falling edge
L: Logic LOW
An: Unchanged
: Rising edge
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.0
ꢀ
2001-11-01ꢀ
15
SILAN [ SILAN MICROELECTRONICS JOINT-STOCK ]
