HD64F3670 Datasheet, PDF (232/323 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

15.2 When Not Using Internal Power Supply Step-Down Circuit
When the internal power supply step-down circuit is not used, connect the external power supply
to the V_CL pin and V_CC pin, as shown in figure 15.2. The external power supply is then input directly
to the internal power supply. The permissible range for the power supply voltage is 3.0 V to 3.6 V.
Operation cannot be guaranteed if a voltage outside this range (less than 3.0 V or more than 3.6 V)
is input.
V_CC
Step-down circuit
V_CL
Internal ^Internal
logic ^power
supply
V_SS
V_CC = 3.0 to 3.6 V
Figure 15.2 Power Supply Connection when Internal Step-Down Circuit is Not Used
Rev. 2.0, 03/02, page 208 of 298