hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 493

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

PSCKT00A_000020020200
This LSI incorporates an internal power supply step-down circuit. Use of this circuit enables the
internal power supply to be fixed at a constant level of approximately 3.0 V, independently of the
voltage of the power supply connected to the external V
when an external power supply is used at 3.0 V or above can be held down to virtually the same
low level as when used at approximately 3.0 V. If the external power supply is 3.0 V or below, the
internal voltage will be practically the same as the external voltage. It is, of course, also possible to
use the same level of external power supply voltage and internal power supply voltage without
using the internal power supply step-down circuit.
15.1
Connect the external power supply to the V
µF between CV
effective simply by adding this external circuit. In the external circuit interface, the external power
supply voltage connected to V
For example, for port input/output levels, the V
V
internal step-down circuit.
SS
level is that for the low level. The A/D converter analog power supply is not affected by the
Figure 15.1 Power Supply Connection when Internal Step-Down Circuit is Used
When Using Internal Power Supply Step-Down Circuit
CC
and V
Section 15 Power Supply Circuit
SS
, as shown in figure 15.1. The internal step-down circuit is made
Internal
logic
(H8/38124 Group Only)
CC
Step-down circuit
and the GND potential connected to V
Internal
power
supply
Section 15 Power Supply Circuit (H8/38124 Group Only)
CC
V
pin, and connect a capacitance of approximately 0.1
CC
CC
V
CV
SS
level is the reference for the high level, and the
CC
Stabilization
capacitance
(approx. 0.1 µF)
CC
Rev. 7.00 Mar 10, 2005 page 451 of 652
pin. As a result, the current consumed
V
CC
= 2.7 to 5.5 V
SS
are the reference levels.
REJ09B0042-0700