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Preliminary User’s Manual U17566EE1V2UM00
Chapter 25 Power Supply Scheme
The microcontroller has general power supply pins for its core, internal
memory and peripherals. These pins are connected to internal voltage
regulators. The microcontroller also has dedicated power supply pins for
certain I/O modules. These pins provide the power for the I/O operations.
25.1 Overview
The following table gives the naming convention of the pins:
Table 25-1
Naming convention of power supply pins
Dedicated function
V
DD
or V
SS
5
n
<none>
CPU core, internal memory and peripherals
•
VDD:
Voltage Drain Drain
•
VSS:
Voltage for Substrate
and Source
level 5 V
(nominative)
instance
number
A
A/D Converter, Voltage Comparators
B
Standard I/O buffer
D
•
µPD703420, µPD70(F)3421,
µPD70(F)3422, µPD70F3423: LCD
Controller/Driver driver I/O
•
µPD70F3424, µPD70F3425,
µPD70F3426: LCD Bus interface I/O
•
µPD70F3427: D[31:16] ports, includes
LCD Bus interface I/O
SM
Stepper Motor Controller/Driver I/O
M
•
µPD70F3427: external memory I/F pins
(except D[31:16] ports)
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