NEC PD754244 Manuel D’Utilisation

User’s Manual  U10676EJ3V0UM

Basic interval
timer/watchdog timer

8-bit timer counter #0

8-bit timer 
counter #1

8-bit timer 
counter #2

Cascaded
16-bit
timer
counter

Interrupt control

Programmable
threshold port

INTBT

RESET

INTT0

TOUT

INTT1

INTT2

PTO0/P30

PTO1/P31

PTO2/P32

INT0/P61

KRREN

KR4/P70-
KR7/P73

AV

REF

/P60

PTH00/P62

PTH01/P63

ALU

Program counter

Program memory

(ROM)

4096 

× 8 bits

Decode and

control

CY

SP (8)

SBS

Bank

General reg.

Data memory

(RAM)

128 

× 4 bits

EEPROM

16 

× 8 bits

Port 3

4

Port 6

4

Port 7

4

Port 8

Bit seq. buffer (16)

P30 to P33

P60 to P63

P70 to P73

P80

Clock
divider

System clock
generator

Standby
control

f

X

/2

N

φ

CPU clock

IC

V

DD

V

SS

RESET

4

In the case of
  PD754144

µ

In the case of
  PD754244

µ

CL1 CL2 X1

X2