UPSD3422_06 Datasheet, PDF (258/293 Pages) STMicroelectronics – Turbo Plus Series Fast Turbo 8032 MCU with USB and Programmable Logic

PSD module
uPSD34xx
28.6.9
JTAG security setting
A programmable security bit in the PSD Module protects its contents from unauthorized
viewing and copying. The security bit is set by clicking on the “Additional PSD Settings” box
in the main flow diagram of PSDsoft Express, then choosing to set the security bit. Once a
file with this setting is programmed into a uPSD34xx using JTAG ISP, any further attempts to
communicate with the uPSD34xx using JTAG will be limited. Once secured, the only JTAG
operation allowed is a full-chip erase. No reading or modifying Flash memory or PLD logic is
allowed. Debugging operations to the MCU Module are also not allowed. The only way to
defeat the security bit is to perform a JTAG ISP full-chip erase operation, after which the
device is blank and may be used again. The 8032 on the MCU Module will always have
access to PSM Module memory contents through the 8-bit 8032 data bus connecting the
two die, even while the security bit is set.
28.6.10
Initial delivery state
When delivered from STMicroelectronics, uPSD34xx devices are erased, meaning all Flash
memory and PLD configuration bits are logic '1.' Firmware and PLD logic configuration must
be programmed at least the first time using JTAG ISP. Subsequent programming of Flash
memory may be performed using JTAG ISP, JTAG debugging, or the 8032 may run firmware
to program Flash memory (IAP).
258/293