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3. Low-Power States (Sleep, Software Standby, and Module Standby)
For low-power consumption, the SH7710 has sleep, software standby, and module standby
states.
The sleep, software standby, and module standby states are switched using the SLEEP
instruction. When the emulator is used, only the sleep state can be cleared with either the
normal clearing function or with the [STOP] button, and a break will occur.
Note: The memory must not be accessed or modified in sleep state.
4. Reset Signals
The SH7710 reset signals are only valid during emulation started with clicking the GO or
STEP-type button. If these signals are enabled on the user system in command input wait
state, they are not sent to the SH7710.
Note: Do not break the user program when the /RESETP, /BREQ, or /WAIT signal is being low.
A TIMEOUT error will occur. If the /WAIT signal is fixed to low during break, a
TIMEOUT error will occur at memory access.
5. Direct Memory Access Controller (DMAC)
The DMAC operates even when the emulator is used. When a data transfer request is
generated, the DMAC executes DMA transfer.
6. Memory Access during User Program Execution
When a memory is accessed from the memory window, etc. during user program execution,
the user program is resumed after it has stopped in the E10A emulator to access the memory.
Therefore, realtime emulation cannot be performed.
The stopping time of the user program is as follows:
Environment:
Host computer: 650 MHz (Pentium
®
III)
SH7710: 60 MHz (CPU clock)
JTAG clock: 3.75 MHz
When a one-byte memory is read from the command-line window, the stopping time will be
about 20 ms.
7. Memory Access during User Program Break
The emulator can download the program for the flash memory area (refer to section 6.22,
Download Function to the Flash Memory Area, in the Debugger Part of the SuperH
TM
Family
E10A Emulator User’s Manual). Other memory write operations are enabled for the RAM
area. Therefore, an operation such as memory write or BREAKPOINT should be set only for
the RAM area.