SH7206 Datasheet, PDF (1018/1188 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

Section 22 Power-Down Modes
22.3.4 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 normal
mode and sleep mode. Disable a module before placing it in the module standby mode. In
addition, do not access the module's registers while it is in the module standby state.
The register states are the same as those in software standby mode. For details, see section 24.3,
Register States in Each Operating Mode.
However, the states of the CMT and DAC registers are exceptional. In the CMT, all registers are
initialized in software standby mode, but retain their previous values in module standby mode. In
the DAC, all registers retain their previous values in software standby mode, but are initialized in
module standby mode.
(2) Canceling Module Standby Function
The module standby function can be canceled by clearing the MSTP bits to 0, or by a power-on
reset (only possible for H-UDI, UBC, and DMAC). When taking a module out of the module
standby state by clearing the corresponding MSTP bit to 0, read the MSTP bit to confirm that it
has been cleared to 0.
Rev. 3.00 Jun. 18, 2008 Page 994 of 1160
REJ09B0191-0300