HD64F2638F20J Datasheet, PDF (1021/1512 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

H8S/2639, H8S/2638, H8S/2636,
H8S/2630, H8S/2635 Group
Section 23B Power-Down Modes [HD64F2636UF, HD6432636UF, HD64F2638UF, HD6432638UF,
HD64F2638WF, HD6432638WF, HD64F2639UF, HD6432639UF, HD64F2639WF, HD6432639WF,
HD64F2630UF, HD6432630UF, HD64F2630WF, HD6432630WF, HD6432635F, HD64F2635F, HD6432634F]
23B.7.2 Hardware Standby Mode Timing
Figure 23B-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.
Oscillator
RES
STBY
Oscillation
stabilization
time
Reset
exception
handling
Figure 23B-4 Hardware Standby Mode Timing
23B.8 Watch Mode (U-Mask, W-Mask Version, H8S/2635 Group Only)
23B.8.1 Watch Mode
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’s 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.
REJ09B0103-0800 Rev. 8.00
May 28, 2010
Page 971 of 1458