EM78911
8-bit micro-controller
micro-
EM78911
I.General Description
The EM78911 is an 8-bit CID (Call Identification) RISC type microprocessor with low power , high speed CMOS
technology . Integrated onto a single chip are on_chip watchdog (WDT) , RAM , ROM , programmable real time
clock /counter , internal interrupt , power down mode , LCD driver , FSK decoder ,CALL WAITING decoder, DTMF
generator and tri-state I/O . The EM78911 provides a single chip solution to design a CID of calling message_display .
II.Feature
CPU
•Operating
voltage range : 2.5V〜5.5V
•16K×
13 on chip ROM
•2.8K×
8 on chip RAM
•Up
to 36 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 (internal clock 3.579MHz)
1. Sleep mode : CPU and 3.579MHz clock turn off, 32.768KHz clock turn off
2. Idle mode : CPU and 3.579MHz clock turn off, 32.768KHz clock turn on
3. Green mode : 3.579MHz clock turn off, CPU and 32.768KHz clock turn on
4. Normal mode : 3.579MHz clock turn on , CPU and 32.768KHz clock turn on
•Ring
on voltage detector and low battery detector
•Input
port wake up function
•9
interrupt source , 4 external , 5 internal
•100
pin QFP or chip
•Port
key scan function
•Clock
frequency 32.768KHz
•Eight
R-option pins
CID
•Operation
Volltage 3.5
〜6V
for FSK
•Operation
Volltage 2.5
〜6V
for DTMF
•Bell
202 , V.23 FSK demodulator
•DTMF
generator
•Ring
detector on chip
CALL WAITING
•Operation
Volltage 3.6
〜5.5V
•Compatible
with Bellcore special report SR-TSV-002476
•Call-Waiting
(2130Hz plus 2750Hz) Alert Signal Detector
•Good
talkdown and talkoff performance
•Sensitivity
compensated by adjusting input OP gain
LCD
•LCD
operation voltage chosen by software
•Common
driver pins : 16
•Segment
driver pins : 60
•1/4
bias
1
EMC [ ELAN MICROELECTRONICS CORP ]
