HD6412373R RENESAS [Renesas Technology Corp], HD6412373R Datasheet - Page 1045

• Manufacturer Part Number: HD6412373R
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Clearing Hardware Standby Mode: Hardware standby mode is cleared by means of the STBY
pin and the RES pin. When the STBY pin is driven high while the RES pin is low, the reset state is
set and clock oscillation is started. Ensure that the RES pin is held low until the clock oscillator
stabilizes (for details on the oscillation stabilization time, refer to table 24.2). When the RES pin is
subsequently driven high, a transition is made to the program execution state via the reset
exception handling state.
Hardware Standby Mode Timing: Figure 24.3 shows an example of hardware standby mode
timing.
When the STBY pin is driven low after the RES pin has been driven low, a transition is made to
hardware standby mode. Hardware standby mode is cleared by driving the STBY pin high,
waiting for the oscillation stabilization time, then changing the RES pin from low to high.
Hardware Standby Mode Timing when Power Is Supplied (Only H8S/2378 0.18μm F-ZTAT
Group and H8S/2378R 0.18μm F-ZTAT Group): When entering hardware standby mode
immediately after the power is supplied, the RES signal must be driven low for a given period
with retaining the STBY signal high. After the RES signal is canceled, drive the STBY signal low.
Oscillator
RES
STBY
Figure 24.3 Hardware Standby Mode Timing
Rev.7.00 Mar. 18, 2009 page 977 of 1136
stabilization
Oscillation
Section 24 Power-Down Modes
time
REJ09B0109-0700
exception
handling
Reset