EM78871
8-bit Micro-controller
VI.Pin Descriptions
PIN
I/O
DESCRIPTION
POWER
VDD
POWER
Digital power
AVDD
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
SEG0..SEG7
SEG8...SEG47
SEG48..SEG55
SEG56..SEG63
SEG64..SEG71
SEG72..SEG79
VC1..VC5
O
Common driver pins of LCD drivers
O(COM16..COM23) Segment driver pins of LCD drivers
O
SEG0 to SEG7 are shared with COM16 to COM23
SEG48 to SEG79 are shared with IO PORT.
O (I/O : PORTB)
O (I/O : PORTC)
O (I/O : PORT8)
O (I/O : PORT9)
I
Reference voltage input. Each one connect a capacitor (0.1u) with
GND.
FSK , TONE ,
KTONE
TIP
I
I
Should be connected with TIP side of twisted pair lines for FSK.
Should be connected with RING side of twisted pair lines for
FSK.
RING
TONE
KTONE
CW
O
Dual tone output pin
Key tone output. Shared with PORT67.
O (PORT67)
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.
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.
STGT
I/O
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.
SERIAL IO
SCK
IO (PORT60)
O (PORT61)
Master: output pin, Slave: input pin. This pin shared with
PORT60.
Output pin for serial data transferring. This pin shared with
PORT61.
SDO
SDI
I
(PORT62)
Input pin for receiving data. This pin shared with PORT62.
Comparator
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* This specification is subject to be changed without notice.
9
8/23/04 (V1.5)
ELAN [ ELAN MICROELECTRONICS CORP ]
