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R01UH0336EJ0102 Rev.1.02
Page 1484 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 25 On-chip Debugging Unit (OCD)
(5)
Forced Breaks
A user-created program can be forcibly suspended.
(6)
Forced Resetting
The microcontroller can be forcibly reset.
(7)
Real-Time RAM Monitoring (RRM)
Memory can be read while the program is running. Since this read access is
through debugging-dedicated DMA, it barely affects program execution.
(8)
Dynamic Memory Modification (DMM)
Memory can be rewritten while the program is running. Since this rewrite
access is through debugging-dedicated DMA, it barely affects program
execution.
(9)
Measuring Times
– Nexus debugging interface
Using a 32-bit counter, times taken to execute user-created programs can
be measured based on a clock signal obtained by dividing the TCK signal
frequency by two.
– LPD interface
Using a 32-bit counter, times can be measured based on a clock signal
obtained by dividing the CPU clock frequency by eight.
(10)
Masking
The following signal can be masked:
RESET, internal resets
(11)
Selecting if Peripheral I/O Modules Run or Stop during Breaks
Whether peripheral I/O modules run or stop is selectable.
• Peripheral I/O modules always stop operating during a break.
– Watchdog timer (WDTA0)
• Selecting whether modules run or stop during a break
– Timers (TSG2n, TAUBn, TAUJn, ENCAn, OSTMn)
– Asynchronous serial interfaces (UARTHn)
– Three-line serial interfaces (CSIGn)
– CAN controller (FCNn)
– A/D converter (ADCAn)
(12)
Hot Plug-in
The on-chip debugging emulator can be connected and debugging can start
without resetting the CPU while it is running (hot plug-out is not supported).
(13)
Security
To prevent unauthorized parties reading the contents of the flash memory, a
96-bit ID code can be written to the microcontroller. If the code the user inputs
does not match the ID code written to the microcontroller when starting the
debugger, the flash memory is not accessible. If the last bit (bit 95) is set to 0,
the flash memory is not accessible even if the ID codes match.
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