HD64F38024HV Datasheet, PDF (154/684 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip Microcomputer H8 Family/H8/300L Super Low Power Series

Section 5 Power-Down Modes
• When the on-chip oscillator is used
8,192 states (STS2 = STS1 = STS0 = 0) is recommended if the on-chip oscillator is used on
the H8/38124 Group.
5.3.4 Standby Mode Transition and Pin States
When a SLEEP instruction is executed in active (high-speed) mode or active (medium-speed)
mode while bit SSBY is set to 1 and bit LSON is cleared to 0 in SYSCR1, and bit TMA3 is
cleared to 0 in TMA, a transition is made to standby mode. At the same time, pins go to the high-
impedance state (except pins for which the pull-up MOS is designated as on). Port 5 of the
HD64F38024 retains the previous pin state. Figure 5.2 shows the timing in this case.
φ
Internal data bus
SLEEP instruction fetch Fetch of next instruction
SLEEP instruction execution Internal processing
Pins
Port output
High-impedance
Active (high-speed) mode or active (medium-speed) mode
Standby mode
Figure 5.2 Standby Mode Transition and Pin States
Rev. 8.00 Mar. 09, 2010 Page 132 of 658
REJ09B0042-0800