Preliminary User’s Manual U16315EJ1V0UD
382
CHAPTER 23 REGULATOR
23.1 Outline
The 78K0/KD1 Series includes a circuit to realize low-voltage operation inside the device. To stabilize the
regulator output voltage, connect the REGC pin to V
SS
via a 0.1
µ
F capacitor.
The regulator of the 78K0/KD1 Series stops operating in the following cases.
•
During the reset period
•
In STOP mode
•
In HALT mode when the CPU is operating on the subsystem clock
Figure 23-1 shows the block diagram of the periphery of the regulator.
Figure 23-1. Block Diagram of Regulator Periphery
EV
DD
system I/O buffer
Internal digital circuits
Bidirectional
level shifter
A/D converter
Flash memory
( PD78F0124 only)
Regulator
X1, Ring,
sub
oscillator
V
DD
REGC
V
PP
0.1 F
AV
REF
EV
DD
µ
µ
Remark
To use the CPU at high speed (f
XP
= 10 MHz, V
DD
= 4.0 to 5.5 V), connect the REGC pin directly to V
DD
and use at the same potential as the V
DD
pin.