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User’s Manual U16702EE3V2UD00
Chapter 20
Regulator
20.1 Outline
The V850E/RS1 has an on-chip regulator to lower the power consumption and noise.
This regulator supplies a stepped-down V
DD
power supply voltage to the oscillator block and internal
logic circuits (except the A/D converter and I/O buffer).
The regulator output voltage is set to 2.5 V (
±
0.2 V).
Figure 20-1:
Regulator Block Diagram
SS0
DD 0
DD
1
SS
1
DD
SS
SS
DD
DD 1
A/D Converter
4.5 V ~ 5.5 V
I/O Buffer
4.0 V ~ 5.5 V
Bi-direction
Level shifter
I/O Buffer
4.0 V ~ 5.5 V
External Bus I/F
BV
DD
External digital circuits
2.5 V
Oscillator
circuit
Regulator 1
Regulator 0
PLL Synthesizer
REGC0
X2
X1
V
V
V
AV
AV
BV
BV
V
V
REGC1
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