14.3
When Not Using the Internal Power Supply Step-Down Circuit
When the internal power supply step-down circuit is not used, connect the external power supply
to the VCC pin and CVCC pin, as shown in figure 14-2. The external power supply is then input
directly to the internal power supply.
Note: The permissible range for the power supply voltage is 1.8 V to 5.5 V. Operation cannot be
guaranteed if a voltage outside this range (less than 1.8 V or more than 5.5 V) is input.
VCC
Step-down circuit
CVCC
Internal
Internal
power
logic
supply
VSS
Figure 14-2 Power Supply Connection when Internal Step-Down Circuit Is Not Used
373
ETC [ ETC ]
