Hitachi SH7095 Hardware User Manual page 56

stabilization time has elapsed. Turn the cache off before entering standby. In this mode, power
consumption drops substantially because the oscillator stops.
Module Standby Function: The module standby function is available for the multiplier (MULT),
divider (DIVU), 16-bit free-running timer (FRT), serial communications interface (SCI), and the
DMA controller (DMAC) for the on-chip peripheral modules.
The supply of the clock to these on-chip peripheral modules can be halted by setting the
corresponding bits 4–0 (MSTP4–MSTP0) in the standby control register (SBYCR). By using this
function, the power consumption can be reduced.
The external pins of the on-chip peripheral modules in module standby are reset and all registers
except DMAC, MULT, and DIVU are initialized. (The master enable bit (bit 0) of the DMAC's
DMAOR register is initialized to 0). Module standby function is cleared by clearing the MSTP4–
MSTP0 bits to 0.
When MULT has entered the software standby mode, do not execute the DMULS.L, DMULU.L,
MAC.L, MAC.W, MUL.L, MULS, and MULU instructions (all of which are multiplication
instruction) or any instructions that access the MACH and MACL registers (CLRMAC, LDS
MACH/MACL, STS MACH/MACL).
When module standby functions of DMAC are used, set the DMA master enable bit in the DMAC
to 0.
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