EM78910/910A
8-bit Micro-controller
VI. Pin Descriptions
PIN
I/O
POWER
DESCRIPTION
Digital power
Analog power
VDD,
VDD1
AVDD
VSS
POWER
Digital ground
AVSS
Analog ground
XIN
XOUT
PLLC
I
O
I
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
RTF
MEI
I
I
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.
TIP
RING
I
I
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.
CWTIP
CWGS
RDET1
I
I
I
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.
/RINGTIME
I
Determine if the incoming ring is valid. A RC network may be
connected to the pin.
INT0
INT1
INT2
INT3
PORT7(0)
PORT7(1)
PORT7(2)
PORT7(3)
PORT7(4:7)
PORT5
PORT7(0)~PORT7(3) signal can be interrupt signals.
INT2 and INT3 has the same interrupt flag.
IO port
P5.4 ~P5.7
P6.0 ~P6.7
P7.0 ~P7.7
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.
PORT6
PORT7
Key scan function.
P9.0 ~P9.7
PORT9
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
TEST
DTMF
/RESET
I
O
I
reset
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* This specification are subject to be changed without notice.
~ ~
2001/01/12
4
ELAN [ ELAN MICROELECTRONICS CORP ]
