CHAPTER 1 OVERVIEW
User’s Manual U18172EJ2V0UD
18
1.5 Block Diagram
78K0S
CPU
CORE
INTERNAL
HIGH-SPEED
RAM
FLASH
MEMORY
V
SS
Note2
V
DD
Note1
PORT 2
P20-P23
4
POWER ON CLEAR/
LOW VOLTAGE
INDICATOR
POC/LVI
CONTROL
RESET CONTROL
SYSTEM
CONTROL
HIGH-SPEED
INTERNAL
OSCILLATOR
RESET/P34
X1/P23
X2/P22
16-bit TIMER/
EVENT COUNTER 00
TO00/TI010/P21
TI000/P20
TOH1/P20
8-bit TIMER H1
INTP0/P21
INTP1/P32
ANI0/P20-
ANI3/P23
4
A/D CONVERTER
INTERRUPT
CONTROL
PORT 3
P32
P34
PORT 4
P40, P43
2
LOW-SPEED
INTERNAL
OSCILLATOR
WATCHDOG TIMER
Notes 1.
In the 78K0S/KU1+, V
DD
functions alternately as the A/D converter reference voltage input. When using
the A/D converter, stabilize V
DD
at the supply voltage used (2.7 to 5.5 V).
2.
In the 78K0S/KU1+, V
SS
functions alternately as the ground potential of the A/D converter. Be sure to
connect V
SS
to a stabilized GND (= 0 V).