H8S-2350 RENESAS [Renesas Technology Corp], H8S-2350 Datasheet - Page 728

• Manufacturer Part Number: H8S-2350
• Description: 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 20 Power-Down Modes
20.5.2
DMAC/DTC Module Stop
Depending on the operating status of the DMAC or DTC, the MSTP15 and MSTP14 bits may not
be set to 1. Setting of the DMAC or DTC module stop mode should be carried out only when the
respective module is not activated.
For details, refer to section 7, DMA Controller (DMAC), and section 8, Data Transfer Controller
(DTC).
On-Chip Supporting Module Interrupt
Relevant interrupt operations cannot be performed in module stop mode. Consequently, if module
stop mode is entered when an interrupt has been requested, it will not be possible to clear the CPU
interrupt source or the DMAC or DTC activation source. Interrupts should therefore be disabled
before entering module stop mode.
Writing to MSTPCR
MSTPCR should only be written to by the CPU.
20.6
20.6.1
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 supporting modules, and oscillator all stop.
However, the contents of the CPU’s internal registers, RAM data, and the states of on-chip
supporting modules other than the SCI and A/D converter, and 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. 3.00 Sep 15, 2006 page 694 of 988
REJ09B0330-0300
Usage Notes
Software Standby Mode
Software Standby Mode