Section 2 Software Specifications when Using the SH7781
Rev. 2.00 Jan. 28, 2008 Page 12 of 32
REJ10J1422-0200
11. Memory Access during Break
In the enabled MMU, when a memory is accessed and a TLB error occurs during break, it can
be selected whether the TLB exception is controlled or the program jumps to the user
exception handler in [TLB Mode] in the [Configuration] dialog box. When [TLB miss
exception is enable] is selected, a “Communication Timeout error” will occur if the TLB
exception handler does not operate correctly. When [TLB miss exception is disable] is
selected, the program does not jump to the TLB exception handler even if a TLB exception
occurs. Therefore, if the TLB exception handler does not operate correctly, a “Communication
Timeout error” will not occur but the memory contents may not be correctly displayed.
12. Loading Sessions
Information in [JTAG clock] of the [Configuration] dialog box cannot be recovered by loading
sessions. Thus the TCK value will be 5 MHz.
13. [IO] window
⎯ Display and modification
Do not change values of the User Break Controller because it is used by the emulator.
For each watchdog timer register, there are two registers to be separately used for write and
read operations.
Table 2.3 Watchdog Timer Register
Register Name Usage Register
WTCSR(W) Write Watchdog timer control/status register
WTCNT(W) Write Watchdog timer counter
WTCSR(R) Read Watchdog timer control/status register
WTCNT(R) Read Watchdog timer counter
⎯ The watchdog timer operates only when the user program is executed. Do not change the
value of the frequency change register in the [IO] window or [Memory] window.
⎯ The internal I/O registers can be accessed from the [IO] window. However, note the
following when accessing the SDMR register of the bus-state controller. Before accessing
the SDMR register, specify addresses to be accessed in the I/O-register definition file
(SH7781.IO) and then activate the HEW. After the I/O-register definition file is created,
the MPU’s specifications may be changed. If each I/O register in the I/O-register
definition file differs from addresses described in the hardware manual, change the I/O-
register definition file according to the description in the hardware manual. The I/O-
register definition file can be customized depending on its format. Note that, however, the
E200F emulator does not support the bit-field function.
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