HD6417706 Datasheet, PDF (585/709 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series

22.3.3 Module Standby Function
• Transition to Module Standby Function
Setting the standby control register MSTP8 to MSTP4, MSTP2 to MSTP0 bits to 1 halts the
supply of clocks to the corresponding on-chip supporting modules. This function can be used to
reduce the power consumption in normal mode and sleep mode. The module standby function
holds the state prior to halt of the external pins of the on-chip supporting modules. TMU external
pins hold their state prior to the halt. SCI external pins go to the reset state. With a few exceptions,
all registers hold their values.
Bit
Value Description
MSTP8 0
UBC runs.
1
Supply of clock to UBC halted.
MSTP7 0
DMAC runs.
1
Supply of clock to DMAC halted.
MSTP6 0
DAC runs.
1
Supply of clock to DAC halted.
MSTP5 0
ADC runs.
1
Supply of clock to ADC halted, and all registers initialized.
MSTP4 0
SCIF runs.
1
Supply of clock to SCIF halted.
MSTP2 0
1
TMU runs.
Supply of clock to TMU halted. Registers initialized.*¹
MSTP1 0
1
RTC runs.
Supply of clock to RTC halted. Register access prohibited.*²
MSTP0 0
SCI runs.
1
Supply of clock to SCI halted.
Notes: 1. The registers initialized are the same as in the software standby mode (table 22.3).
2. The counter runs.
• Clearing the Module Standby Function
The module standby function can be cleared by clearing the MSTP8 to MSTP4, MSTP2 to
MSTP0 bits to 0, or by a power-on reset or manual reset.
Rev. 4.00, 03/04, page 539 of 660