8.10.00 J-TRACE ARM Segger Microcontroller Systems, 8.10.00 J-TRACE ARM Datasheet - Page 169
![JTAG EMULATOR ARM7/ARM9 ETM](/photos/9/27/92738/8_10_00-j-trace-arm_sml.jpg)
8.10.00 J-TRACE ARM
Manufacturer Part Number
8.10.00 J-TRACE ARM
Description
JTAG EMULATOR ARM7/ARM9 ETM
Manufacturer
Segger Microcontroller Systems
Type
Emulatorr
Specifications of 8.10.00 J-TRACE ARM
Contents
Emulation Module
For Use With/related Products
ARM7, ARM9
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
899-1006
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7.8.5.3 Hardware watchdog
J-Link / J-Trace (UM08001)
The hardware watchdog of a STM32 device can be enabled by programming the
option bytes. If the hardware watchdog is enabled the device is reset periodically if
the watchdog timer is not refreshed and reaches 0. If the hardware watchdog is
enabled by an application which is located in flash and which does not refresh the
watchdog timer, the device can not be debugged anymore.
Disabling the hardware watchdog
In order to disable the hardware watchdog the option bytes have to be re-pro-
grammed. SEGGER offers a free command line tool which reprograms the option
bytes in order to disable the hardware watchdog. For more information about the
STM32 commander, please refer to J-Link STM32 Commander (Command line tool)
on page 81.
Note:
ing the option bytes will read-protect the flash of the STM32. The STM32 commander
will also override the read-protection of the STM32 device after disabling the watch-
dog. Please also note that unsecuring a read-protected device will cause a mass
erase of the flash memory.
In order to re-program the option bytes they have to be erased first. Eras-
© 2004-2011 SEGGER Microcontroller GmbH & Co. KG
169
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