EM78910/910A
8-bit Micro-controller
VI. Pin Descriptions
PIN
VDD,
VDD1
AVDD
VSS
AVSS
XIN
XOUT
PLLC
RTF
MEI
TIP
RING
CWTIP
CWGS
RDET1
I/O
POWER
DESCRIPTION
Digital power
Analog power
Digital ground
Analog ground
Input pin for 32.768 kHz oscillator
Output pin for 32.768 kHz oscillator
Phase loop lock capacitor, connect a capacitor 0.01u to 0.047u with
AVSS
Request to flash input. Detect line DC voltage changed
Multiple extension internetworking input. 1.2 DC voltage detection
can be used as on-hook/off-hook detection.
It should be connected with TIP side of twisted pair lines for FSK.
It should be connected with RING side of twisted pair lines for
FSK.
It should be connected with TIP side of twisted pair lines for CW.
The input OP output pin for gain adjustment of CW.
It detect the energy on the twisted pair lines. This pin is coupled to
the twisted pair lines through an attenuating network for ring signal
detect.
Determine if the incoming ring is valid. A RC network may be
connected to the pin.
PORT7(0)~PORT7(3) signal can be interrupt signals.
INT2 and INT3 has the same interrupt flag.
POWER
I
O
I
I
I
I
I
I
I
I
/RINGTIME
INT0
INT1
INT2
INT3
P5.4 ~P5.7
P6.0 ~P6.7
P7.0 ~P7.7
I
PORT7(0)
PORT7(1)
PORT7(2)
PORT7(3)
PORT7(4:7)
PORT5
PORT6
PORT7
P9.0 ~P9.7
TEST
DTMF
/RESET
PORT9
I
O
I
IO port
PORT 5 can be INPUT or OUTPUT port each bit.
PORT 6 can be INPUT or OUTPUT port each bit.
PORT 7 can be INPUT or OUTPUT port each bit.
Internal Pull high function.
Key scan function.
PORT 9 can be INPUT or OUTPUT port each bit.
And can be set to wake up watchdog timer.
Test pin into test mode , normal low
DTMF tone output
reset
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* This specification are subject to be changed without notice.
~
4
~
2001/01/12
EMC [ ELAN MICROELECTRONICS CORP ]
