Toshiba T2N - Manual (Page 26)

1.System Configuration
User’s Manual 11
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Operation Mode Switch
The Operation Mode Switch is provided on the CPU module.
This switch controls T2N operation (RUN/P-RUN/HALT).
Stop user program execution (HALT mode)
Start user program execution (RUN mode)
CPU status is shown below after power up or after the operation mode is
changed to RUN from HALT.
Setting
Position
User
Program
Operation
Mode
Initial Load
Program
exe : executed
- :not executed
Memory
Protection
Operation
Mode Change
by the
programmer
SW.2:OFF exe HALT Stopped HALT
SW.2:ON -
No protect not available
SW.2:OFF exe RUN
SW.2:ON -
No protect
SW.2:OFF P-RUN
Executed RUN
SW.2:ON
- protect
available
As shown the above table, initial load (program transfer into EEPROM from RAM)
performs in the RUN mode when setting SW.2 to OFF except P-RUN position.
1. The operation mode switch is set to HALT at the factory.
2. “P-RUN” is state that the operation mode switch set to P-RUN.
The user program and the first half of data register (D0000 to D2047) are
in the write protect mode and user can’t write or change them.
3. Normally, the programming is carried out in the HALT mode.
4. When shifting to the RUN mode with the ROM/RAM switch in the ROM
position , operation will commerce after program transfer has been
executed. (that is, it is called initial load.)
5. For details of the operation mode, see Part2, Section 2.3.
6. When the operation mode switch is changed quickly from HALT to P-RUN,
program transfer is interrupted.
Turn to P-RUN after the RUN LED is lit.
7. The RAM is backed up by battery of the T2N. When the battery voltage
drops and the T2N can’t keep retentive area in the RAM, CPU clears all the
retentive data.
Then CPU checks user program BCC. If error is detected, CPU registered
error.
NOTE
HALT
P-RUN
RUN