Technical information

Section 3 Software Specifications when Using the SH72546RFCC, SH72544R, SH72543R, SH72531, and SH72531FCC
Rev. 2.00 Feb. 18, 2009 Page 34 of 94
REJ10J1938-0200
3. Low-Power States (Sleep, Software Standby, and Module Standby)
⎯ When the emulator is used, the sleep state can be cleared with either the clearing function
or with the [STOP] button, and a break will occur.
⎯ Emulation is not possible in the hardware standby mode.
4. Reset Signals
The MCU 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 MCU.
Note: Do not break the user program when the /RES or /WAIT signal is being low. A
TIMEOUT error will occur. If the /BREQ or /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
During execution of the user program, memory is accessed by the following two methods, as
shown in table 3.2.
Table 3.2 Memory Access during User Program Execution
Method Description
H-UDI read/write The stopping time of the user program is short because memory is
accessed by the dedicated bus master.
Short break This method is not available for this product (do not set short break).
The method for accessing memory during execution of the user program is specified by using
the [Configuration] dialog box.