h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 789

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

22.7.2
Figure 22.4 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.
22.8
22.8.1
CPU operation makes a transition to watch mode when the SLEEP instruction is executed in high-
speed mode or subactive mode with SBYCR SSBY=1, LPWRCR DTON = 0, and TCSR (WDT1)
PSS = 1.
In watch mode, the CPU is stopped and supporting modules other than WDT1 are also stopped.
The contents of the CPU is internal registers, the data in internal RAM, and the statuses of the
internal supporting modules (excluding the SCI, ADC, HCAN, and Motor control PWM) and I/O
ports are retained.
Oscillator
RES
STBY
Hardware Standby Mode Timing
Watch Mode
Watch Mode
Figure 22.4 Hardware Standby Mode Timing
Rev. 5.00 Sep 22, 2005 page 763 of 1136
Oscillation
stabilization
time
Section 22 Power-Down Modes
REJ09B0257-0500
exception
handling
Reset