EM78910A
8-bit Micro-controller
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* This specification are subject to be changed without notice.
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12/27/2002 (V1.2)
I.General Description
The EM78910A is an 8-bit CID (Call Identification) RISC type microprocessor with low power, high speed
CMOS technology. This integrated single chip has on_chip watchdog (WDT), RAM, ROM, programmable real time
clock/counter, internal interrupt, power down mode, FSK decoder, Call waiting decoder, SDT (Stuttered dial tone)
decoder, DTMF generator, MEI (Multiple Extension Internetworking) function, RTF (Request To Flash) function and
tri-state I/O. The EM78910A provides a single chip solution to design a CID of calling message_display.
II. Feature
CPU
Operating voltage range : 2.5V5.5V
16K 13 Read Only Memory
1.1K8 on chip RAM
Up to 28 bi-directional tri-state I/O ports
8 level stack for subroutine nesting
8-bit real time clock/counter (TCC)
Two sets of 8 bit counters can be interrupt sources
Selective signal sources and trigger edges , and with overflow interrupt
Programmable free running on chip watchdog timer
99.9 single instruction cycle commands
Four modes (Main clock 3.579MHz or 1.79MHz)
Set code option bit0(MCLK) : 0/1 3.579MHz/1.79MHz
Mode
CPU status
Main clock
32.768kHz clock status
Sleep mode
Turn off
Turn off
Turn off
Idle mode
Turn off
Turn off
Turn on
Green mode
Turn on
Turn off
Turn on
Normal mode
Turn on
Turn on
Turn on
Ring on voltage detector
Universal Low battery detector
Input port wake up function
9 interrupt source , 4 external , 5 internal
Port key scan function
Clock frequency 32.768KHz
Eight R-option pins
CID
Bell 202 , V.23 FSK demodulator
DTMF generator
Ring detector on chip
CALL WAITING
Compatible with Bellcore special report SR-TSV-002476
Call-Waiting (2130Hz plus 2750Hz) alert signal detection
Good talkdown and talkoff performance
Sensitivity compensated by adjusting input OP gain
SDT
Stuttered Dial Tone (350Hz plus 440Hz) signal detection
MEI/RTF
Compatible with TIA/EIA-777(TIA SP-4078)
MEI(Multiplex Extension Internetworking) and RTF(Request To Flash) functions
PACKAGE
47-pin die form with MEI/RTF (EM78910AAH, POVD disable)(EM78910ABH, POVD enable)
EM78910A
8-bit Micro-controller
__________________________________________________________________________________________________________________________________________________________________
* This specification are subject to be changed without notice.
~ ~
~ ~
~ ~
~ ~
4
12/27/2002 (V1.2)
VI. Pin Descriptions
PIN I/O DESCRIPTION
VDD,
VDD1
AVDD
POWER Digital
power
Analog power
VSS
AVSS
POWER Digital
ground
Analog ground
XIN
I
Input pin for 32.768 kHz oscillator
XOUT
O
Output pin for 32.768 kHz oscillator
PLLC
I
Phase loop lock capacitor, connect a capacitor 0.01u to 0.047u with
AVSS
RTF
I
Request to flash input. Detect line DC voltage changed
MEI
I
Multiple extension internetworking input. 1.2 DC voltage detection
can be used as on-hook/off-hook detection.
TIP
I
It should be connected with TIP side of twisted pair lines for FSK.
RING
I
It should be connected with RING side of twisted pair lines for
FSK.
CWTIP
I
It should be connected with TIP side of twisted pair lines for CW.
CWGS
I
The input OP output pin for gain adjustment of CW.
RDET1
I
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)
PORT7(0)~PORT7(3) signal can be interrupt signals.
INT2 and INT3 has the same interrupt flag.
IO port
P5.4 ~P5.7
PORT5
PORT 5 can be INPUT or OUTPUT port each bit.
P6.0 ~P6.7
PORT6
PORT 6 can be INPUT or OUTPUT port each bit.
P7.0 ~P7.7
PORT7
PORT 7 can be INPUT or OUTPUT port each bit.
Internal Pull high function.
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
I
Test pin into test mode , normal low
DTMF
O
DTMF tone output
/RESET I
reset
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