r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 1206

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 25 Power-Down Modes
(2)
Sleep mode is exited by any interrupt, or signals at the RES, or STBY pins.
• Exiting Sleep Mode by Interrupts:
• Exiting Sleep Mode by RES Pin:
• Exiting Sleep Mode by STBY Pin:
25.2.3
(1)
If a SLEEP instruction is executed when the SSBY bit in SBYCR is set to 1, software standby
mode is entered. In this mode, the CPU, on-chip peripheral functions, and oscillator all stop.
However, the contents of the CPU’s internal registers, RAM data, and the states of on-chip
peripheral functions other than the SCI, IIC, and SSU, and the states of I/O ports, are retained.
Whether the address bus and bus control signals are placed in the high-impedance state or retain
the output state can be specified by the OPE bit in SBYCR.
In this mode the oscillator stops, and therefore power dissipation is significantly reduced.
Rev. 1.00 Sep. 19, 2008 Page 1176 of 1342
REJ09B0467-0100
When an interrupt occurs, sleep mode is exited and interrupt exception processing starts. Sleep
mode is not exited if the interrupt is disabled, or interrupts other than NMI are masked by the
CPU.
Setting the RES pin level low selects the reset state. After the stipulated reset input duration,
driving the RES pin high starts the CPU performing reset exception processing.
When the STBY pin level is driven low, a transition is made to hardware standby mode.
Exiting Sleep Mode
Transition to Software Standby Mode
Software Standby Mode