SH7205 Datasheet, PDF (1613/1904 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

Section 30 Power-Down Modes
INTC, BSC, I/O ports, PFC, and peripheral modules. After the reconfiguration, the retention of the
pin state can be canceled by reading 1 from the IOKEEP bit in DSFR and then writing 0 to it.
30.3.8 Module Standby Function
(1) Transition to Module Standby Function
Setting the standby control register MSTP bits to 1 halts the supply of clocks to the corresponding
on-chip peripheral modules. This function can be used to reduce the power consumption in dual-
processor mode, single-processor mode, and dual-sleep mode. Disable a module before placing it
in module standby mode. In addition, do not access the module’s registers while it is in the module
standby state.
For details on the states of registers, see section 32.3, Register States in Each Operating Mode.
(2) Canceling Module Standby Function
The module standby function can be canceled by clearing each MSTP bit to 0, or by a power-on
reset (only possible for RTC, H-UDI, and UBC). When canceling the module standby function by
clearing the corresponding MSTP bit to 0, read the MSTP bit to confirm that it has been cleared to
0.
Rev. 1.00 Mar. 25, 2008 Page 1581 of 1868
REJ09B0372-0100