Renesas SuperH SH7600 Series Manual de usuario descargar pdf (Pagina 14)

3. Low-Power States (Sleep and Standby)

For low-power consumption, the SH7616 has sleep and standby modes.

The sleep and standby modes are switched using the SLEEP instruction. The sleep mode can

be cleared by either normal clearing or by the satisfaction of a break condition (including

BREAK key input), and the user program breaks. The standby mode can be cleared with the

normal clearing function, and after the standby mode is cleared, the user program operates

correctly. Note that, however, if a command has been entered in standby mode, no commands

can be used from the emulator after the standby mode is cleared. The states cannot be

canceled by the [STOP] button.

Notes: 1. After the sleep mode is cleared by a break, execution restarts at the instruction

following the SLEEP instruction.

2. If the memory is accessed or modified in sleep mode, the sleep mode is cleared and

execution starts at the instruction following the SLEEP instruction.

4. /RES Signal

The SH7616 /RES signal is only valid during user program execution started with clicking the

GO or STEP-type button. If this signal is enabled on the user system in command input wait

state, it is not sent to the SH7616.

Note: Do not start user program execution or access the memory while the control input signal

(/RES, /WAIT, or /BRLS) is being low. A TIMEOUT error will occur.

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.

Note: If the DMAC transfer is in the burst mode and the transfer size is 4 Mbytes or more, a

TIMEOUT error will occur.

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 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)

SH7616: 50 MHz (CPU clock)

JTAG clock: 10 MHz (TCK clock)

When a one-byte memory is read from the command-line window, the stopping time will be

about 35 ms.

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Renesas SuperH SH7600 Series Manual de usuario Pagina 14