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Pin
#
Signal Name
Signal Type
Signal Leve
l
Signal Description
Currently Configured For
Other Uses (With different SW) ***
1
CS3
Output
CMOS
Chip Select 3 - (Active Low) ***
Not Supported in Current SW
Future Use - Intended to allow addition of
general purpose bi-directional parallel
port.
2
DATA0
Bi-directional
CMOS
Read / Write Data -
Character Display
Bi-directional parallel port ***
3
DATA1
Bi-directional
CMOS
Read / Write Data -
Character Display
Bi-directional parallel port ***
4
DATA2
Bi-directional
CMOS
Read / Write Data -
Character Display
Bi-directional parallel port ***
5
DATA3
Bi-directional
CMOS
Read / Write Data -
Character Display
Bi-directional parallel port ***
6
DATA4
Bi-directional
CMOS
Read / Write Data -
Character Display
Bi-directional parallel port ***
7
DATA5
Bi-directional
CMOS
Read / Write Data -
Character Display
Bi-directional parallel port ***
8
DATA6
Bi-directional
CMOS
Read / Write Data -
Character Display
Bi-directional parallel port ***
9
DATA7
Bi-directional
CMOS
Read / Write Data -
Character Display
Bi-directional parallel port ***
10
DATA8
Bi-directional
CMOS
Read / Write Data -
Character Display
Bi-directional parallel port ***
or
ADDR1
Output
CMOS
Address 1 (Not Jumpered)
Not Used
Memory Mapped Display
11
ENA
Output
CMOS
Read / Write Enable (Active High) -
Character Display
12
CS2
Output
CMOS
Chip Select 2 - (Active Low) -
Character Display
or
WR
Output
CMOS
Write - (Active Low) (Not Jumpered)
Not Used
Memory Mapped Display
13
CASP_ON
Bi-directional
CMOS
Turns Phone On / Off
Output - Phone On = Hi
14
KEY0
Output
CMOS
Keypad Interface Row Select -
15
KEY1
Output
CMOS
Keypad Interface Row Select
16
KEY2
Output
CMOS
Keypad Interface Row Select
17
KEY3
Bi-directional w Resistor
CMOS
Keypad Row / Column -
Row Select in SW (Output)
18
KEY4
Bi-directional w Resistor
CMOS
Keypad Row / Column -
Row Select in SW (Output)
19
KEY5
Bi-directional w Resistor
CMOS
Keypad Row / Column - debounce = 46ms
Column in SW (Input)
20
KEY6
Bi-directional w Resistor
CMOS
Keypad Row / Column - debounce = 46ms
Column in SW (Input)
21
KEY7
Bi-directional w Resistor
CMOS
Keypad Row / Column - debounce = 46ms
Column in SW (Input)
22
KEY8
Bi-directional w Resistor
CMOS
Keypad Row / Column - debounce = 46ms
Column in SW (Input)
23
KEY9
Bi-directional w Resistor
CMOS
Keypad Row / Column - debounce = 46ms
Column in SW (Input)
24
BKLT_PWM
Output
CMOS
Back Lighting (Pulse Width Modulated)
Character Display
Memory Mapped Display
12.8 kHz, duty cycle 90% On
25
RD
Output
CMOS
External Device Read Enable - (Active Low)
Not Supported in Current SW
26
RSTF
Input
CMOS
Reset CASP only - Active Low
27
DATA_TX
Output
CMOS
RS-232 Transmit Data
to
C
on
tr
ol
le
r
300 to 9600 baud
38400 for Loader, 115200 for Burn Flash
28
DATA_RX2
Input
CMOS
RS-232 Receive Data
f
ro
m
Co
n
tr
ol
le
r
300 to 9600 baud
38400 for Loader, 115200 for Burn Flash
29
SOFT_ON
Input
CMOS
Toggle to turn phone on / off
Active High - Must be high for
3 seconds to toggle
30
RING_PWM
Output
CMOS
Ringer Interface (Pulse Width Modulated)
1 kHz, 50 % duty cycle
31
RI
Output
CMOS
RS-232 Ring Indicator (CMOS Levels)
RS-232 Flow Control
Ring indication
32
DCD
Output
CMOS
RS-232 Data Carrier Detect (CMOS Levels)
RS-232 Flow Control
Dial tone indication
VDD for CMOS = 3.0 Vdc Outputs are 2.4 Vdc = 1, 0.4 Vdc = 0