EM78808
8-bit Micro-controller
VI. Pin Descriptions
PIN
I/O
DESCRIPTION
POWER
VDD
AVDD
POWER
Digital power
Analog power
They connect together when package as 128 pin QFP.
Digital ground
GND
POWER
AVSS
Analog ground
They connect together when package as 128 pin QFP.
CLOCK
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
GND
LCD
COM0..COM15 O
SEG0...SEG7
Common driver pins of LCD drivers
Segment driver pins of LCD drivers
O
SEG8..SEG47 (COM16..COM23) SEG0 to SEG7 are share with COM16 to COM23
SEG48..SEG55 O (I/O : PORTB)
SEG56..SEG63 O (I/O : PORTC)
SEG64..SEG71 O (I/O : PORT8)
SEG72..SEG79 O (I/O : PORT9)
SEG8 to SEG79 are shared with IO PORT.
VC1..VC5
I
Reference voltage input. Each one connect a capacitor (0.1u) with
GND.
FSK , TONE ,
KTONE
TIP
RING
TONE
I
I
O
Should be connected with TIP side of twisted pair lines for FSK.
Should be connected with RING side of twisted pair lines for FSK.
Dual tone output pin
KTONE
O (PORT67)
Key tone output. Shared with PORT67.
CW
CWGS
CWIN
DTMF
receiver
EST
O
I
Gain adjustment of single-ended input OP Amp
Single-ended input OP Amp for call waiting decoder
O
Early steering output. Presents a logic high immediately when the
digital algorithm detects a recognizable tone-pair (signal condition).
Any momentary loss of signal condition will cause EST to return to a
logic low. This pin shared with PORT56.
STGT
I/O
Steering input/guard time output (bi-directional). A voltage greater
than Vtst detected at ST causes the device to register the detected
tone-pair and update the output latch.
A voltage less than Vtst frees the device to accept a new tone-pair. The
GT output acts to reset the external steering time-constant; its state is
a function of EST and the voltage on ST . This pin shared with
PORT55.
OP
OP-
OP+
OPO
I (PORT55)
I (PORT56)
O (PORT57)
The negative Vin input pin of the OP. This pin shared with PORT55.
The positive Vin input pin of the OP. This pin shared with PORT56.
The output of OP. This pin shared with PORT57.
SERIAL IO
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* This specification is subject to change without notice.
8/1/2004 (V3.1)
59
ELAN [ ELAN MICROELECTRONICS CORP ]
