This text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here in

white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader. white to force landscape pages to be ...

MBG639

PORT 0

FLIP-FLOP

PORT 0

BUFFER

HIGHER

PROGRAM

COUNTER

LOWER

PROGRAM

COUNTER

PROGRAM

STATUS

WORD

MEMORY

BANK

FLIP-FLOPS

RESIDENT

OTP-ROM

8 kbytes

DECODE

5

888

8

P0.0 to P0.7

8

8

88

8

8

8

TIMER/

EVENT

COUNTER

32

INTERNAL

CLOCK

FREQ.

30

T1

PORT 1

BUFFER

PORT 1

FLIP-FLOP

P1.0 to P1.6

8

PORT 2

BUFFER

PORT 2

FLIP-FLOP

P2.0 to P2.3

4

4

7

8

P1.7/MDY

MELODY

CONTROL

REGISTER

8

TONE

FILTER

OSCILLATOR

RAM

ADDRESS

REGISTER

ACCUMULATOR

TEMPORARY

REGISTER 1

TEMPORARY

REGISTER 2

ARITHMETIC

INSTRUCTION

REGISTER

AND

DECODER

DECIMAL

ADJUST

CONTROL AND TIMING

XTAL2

XTAL1

RESET

CE/T0

STOP

IDLE

INTERRUPT

INITIALIZE

CONDITIONAL

BRANCH

LOGIC

CE/T0

TIMER

FLAG

CARRY

ACC

ACC BIT

TEST

MULTIPLEXER

8 LEVEL STACK

(VARIABLE LENGTH)

OPTIONAL SECOND

REGISTER BANK

DATA STORE

D

E

C

O

D

E

REGISTER 0

REGISTER 1

REGISTER 2

REGISTER 3

REGISTER 4

REGISTER 5

REGISTER 6

REGISTER 7

timer interrupt

external interrupt

RESIDENT RAM ARRAY

128 bytes

derivative

interrupt

8

LOGIC UNIT

T 1

LGF

REGISTER

8

HGF

REGISTER

8

SINE WAVE

GENERATOR

INTERRUPT

LOGIC

8

EEPROM

DATA

TRANSFER

8

EEPROM

ADDRESS

REGISTER

8

EEPROM

CONTROL

REGISTER

8

TIMER 2

REGISTER

8

TIMER 2

RELOAD

REGISTER

8

EEPROM

128 bytes

PCD3755x

POWER-ON-RESET

VPOR

RESET

Fig.1 Block diagram.