Datasheet

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TMS320F28379S , TMS320F28377S
TMS320F28376S, TMS320F28375S, TMS320F28374S
SPRS881C –AUGUST 2014–REVISED MAY 2016 www.ti.com
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Detailed Description Copyright © 2014–2016, Texas Instruments Incorporated
6.10 Dual Code Security Module
The dual code security module (DCSM) prevents access to on-chip secure memories. The term “secure”
means access to secure memories and resources is blocked. The term “unsecure” means access is
allowed; for example, through a debugging tool such as Code Composer Studio™ (CSS).
The code security mechanism offers protection for two zones, Zone 1 (Z1) and Zone 2 (Z2). The security
implementation for both the zones is identical. Each zone has its own dedicated secure resource (OTP
memory and secure ROM) and allocated secure resource (CLA, LSx RAM, and flash sectors).
The security of each zone is ensured by its own 128-bit password (CSM password). The password for
each zone is stored in an OTP memory location based on a zone-specific link pointer. The link pointer
value can be changed to program a different set of security settings (including passwords) in OTP.
6.11 Timers
CPU-Timers 0, 1, and 2 are identical 32-bit timers with presettable periods and with 16-bit clock
prescaling. The timers have a 32-bit count-down register that generates an interrupt when the counter
reaches zero. The counter is decremented at the CPU clock speed divided by the prescale value setting.
When the counter reaches zero, it is automatically reloaded with a 32-bit period value.
CPU-Timer 0 is for general use and is connected to the PIE block. CPU-Timer 1 is also for general use
and is connected to INT13 of the CPU. CPU-Timer 2 is reserved for TI-RTOS. It is connected to INT14 of
the CPU. If TI-RTOS is not being used, CPU-Timer 2 is available for general use.
CPU-Timer 2 can be clocked by any one of the following:
• SYSCLK (default)
• Internal zero-pin oscillator 1 (INTOSC1)
• Internal zero-pin oscillator 2 (INTOSC2)
• X1 (XTAL)
• AUXPLLCLK
6.12 Nonmaskable Interrupt With Watchdog Timer (NMIWD)
The NMIWD module is used to handle system-level errors. The conditions monitored are:
• Missing system clock due to oscillator failure
• Uncorrectable ECC error on CPU access to flash memory
• Uncorrectable ECC error on CPU, CLA, or DMA access to RAM
If the CPU does not respond to the latched error condition, then the NMI watchdog will trigger a reset after
a programmable time interval. The default time is 65536 SYSCLK cycles.