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MBH909

PORT 0

FLIP-FLOP

PORT 0

BUFFER

HIGHER

PROGRAM

COUNTER

LOWER

PROGRAM

COUNTER

PROGRAM

STATUS

WORD

MEMORY

BANK

FLIP-FLOPS

RESIDENT

OTP-ROM

4.5 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

7

8

P1.7/RCO

RTC

RTC1

RTC2

8

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

CLK2

CLK1

RESIDENT RAM ARRAY

224 bytes

8

LOGIC UNIT

T 1

INTERRUPT

LOGIC

8

C2HB

8

8

8

8

8

PCD3745A

C2LB

C1HB

C1LB

PCCR

Fig.1 Block diagram.