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OSCILLATOR

MBG098

PORT 0

FLIP-FLOP

PORT 0

BUFFER

88

HIGHER

PROGRAM

COUNTER

LOWER

PROGRAM

COUNTER

PROGRAM

STATUS

WORD

MEMORY

BANK

FLIP-FLOPS

RESIDENT ROM

4 kbytes

DECODE

8

T1

8

8

5

888

8

8

P0.0 to P0.7

RAM

ADDRESS

REGISTER

ACCUMULATOR

TEMPORARY

REGISTER 1

PCD3349A

HGF

REGISTER

8

88

LGF

REGISTER

SINE WAVE

GENERATOR

TEMPORARY

REGISTER 2

ARITHMETIC

LOGIC UNIT

INSTRUCTION

REGISTER

&

DECODER

DECIMAL

ADJUST

CONTROL & TIMING

XTAL 2

XTAL 1

RESET

STOP

IDLE

INTERRUPT

INITIALIZE

CONDITIONAL

BRANCH

LOGIC

CE / T0

CE / T0

T1

TIMER

FLAG

CARRY

ACC

ACC BIT

TEST

RESIDENT RAM ARRAY

224 bytes

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

PORT 1

FLIP-FLOP

PORT 1

BUFFER

P1.0 to P1.7

8

8

PORT 2

FLIP-FLOP

PORT 2

BUFFER

P2.0 to P2.3

4

4

TIMER/

EVENT

COUNTER

32

INTERNAL

CLOCK

FREQUENCY

30

8

88

8

8

INTERRUPT

LOGIC

timer interrupt

external interrupt

TONE

FILTER

POWER-ON-RESET

VPOR

RESET

Fig.1 Block diagram.