Freescale Semiconductor /MKL81Z7 /DRY /CR

Software Reset

0 (0): No effect.

1 (1): Perform a software reset.

DryIce Enable

0 (0): DryIce clock and prescaler are disabled.

1 (1): DryIce clock and prescaler are enabled.

Tamper Force System Reset

0 (0): Do not force chip reset when tampering is detected.

1 (1): Force chip reset when tampering is detected.

Update Mode

0 (0): DryIce Status Register cannot be written when the Status Register Lock bit within the Lock Register (LR[SRL]) is clear.

1 (1): DryIce Status Register cannot be written when the Status Register Lock bit within the Lock Register (LR[SRL]) is clear and DryIce Tamper Flag (SR[DTF]) is set.

Active Tamper Clock Source

0 (0): Active Tamper Shift Register clocked by 1 Hz prescaler clock.

1 (1): Active Tamper Shift Register clocked by 512 Hz prescaler clock.

Tamper Hysteresis Select

0 (0): Hysteresis is set to a range of 305 mV to 440 mV.

1 (1): Hysteresis is set to a range of 490 mV to 705 mV.

Tamper Passive Filter Enable

0 (0): Tamper pins are configured with passive input filter disabled

1 (1): Tamper pins are configured with passive input filter enabled

Tamper Drive Strength Enable

0 (0): Tamper pins are configured for low drive strength

1 (1): Tamper pins are configured for high drive strength

Tamper Slew Rate Enable

0 (0): Tamper pins are configured for slow slew rate.

1 (1): Tamper pins are configured for fast slew rate.

Secure Register File

0 (00): VBAT Register File is a general purpose register file, it is reset on VBAT POR only and can be accessed by supervisor or non-supervisor software.

2 (10): VBAT Register File is a secure register file that is reset when DryIce Tamper Flag is set. It can only be accessed by software in supervisor mode.

3 (11): VBAT Register File is a secure register file that is reset when DryIce Tamper Flag is set or the DryIce Interrupt asserts. It can only be accessed by software in supervisor mode.

DryIce Prescaler Register