Switching Vcc Voltage (5V, 3.3V) - Renesas 38K0 Instruction Manual

1.6

Switching Vcc Voltage (5V, 3.3V)

M3A-8K02 has two power lines: 5V and Vcc. The 5V line depends on the operating voltage of the board and
the Vcc line depends on the 38K0/38K2 operating voltage. The user must switch the Vcc line between 5V and
3.3V, according to the 38K0/38K2 operating voltage. Select the voltage value with the VCC SELECT Switch (S7
in 1) as shown in Fig. 1.6. Set the Vcc to either 5V (left side) or 3.3V (right side).
In the 38K0/38K2 USB sample firmware, processing differs according to the Vcc value. Please confirm
the firmware settings before setting the Vcc. Using a board with differing voltage than the firmware for
an extended period may result in damage to the chip.
Figure 1.6 Vcc (5V, 3.3V) Switch
RENESAS
1. Vcc Select Switch
Switches Vcc from 3.3V to
5V.
USB F ull-Speed Microcomputers
38K0/38K2 Group M3A-8K02
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