EM78871
8-bit Micro-controller
V.Functional Block Diagram
DATA RAM
DATA RAM
CONTROL
CP
U
CPU
CONTROL
REGISTER
REGISTER
LCD
I/O
LCD DRIVER
LCD DRIVER
TIMING
TIMING
CONTROL
CONTROL
IO
TIMER
TCC
IO
PORT
PORT
COUNTER 1
COUNTER 2
WDT
FSK DECODER
CURRENT DA
Call waiting decoder
DTMF receiver
DATA ROM
PROGRAM
PROGRAM
ROM
DUAL TONE GENERATOR
ROM
KEY TONE
COMPARATOR
SERIAL I/O
Fig.2 Block diagram1
Xin Xout PLLC
ROM
STACK
R2
WDT timer
prescalar
Oscillator
timing control
Instruction
register
ALU
ACC
R1(TCC)
Interruption
control
GENERAL
RAM
R3
R5
Control sleep
and wake-up
on I/O port
Instruction
decoder
R4
DATA & CONTROL BUS
DATA RAM
PORT5
PORT6
PORT7
PORT8
PORT9
PORTB
PORTC
FSK DECODER
Call waiting decoder
FSK DECODER
IOC5
R5
IOC6
R6
IOC7
R7
IOC8
R8
IOC9
R9
IOCB
RB
IOCC
RC
DTMF receiver
DUTMALF TreOceNivEeGr ENERATOR
DUAL TONE GENERATOR
KEY TONE
KEY TONE
SERIAL I/O
P55~P57
P60~P67
SERIAL I/O
P70~P77
P80~P87
P90~P97
PB0~PB7
PC0~PC7
COMPARATOR
COMPARATOR
CURRENT DA
CURRENT DA
OP
Fig.3 Block diagram2
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* This specification is subject to be changed without notice.
8
8/23/04 (V1.5)
ELAN [ ELAN MICROELECTRONICS CORP ]
