908E626 datasheet(21/43 Pages) FREESCALE

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Analog Integrated Circuit Device Data



Freescale Semiconductor

908E626

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

Figure 10. Internal Reset Routing

RESET INTERNAL SOURCES

Autonomous Watchdog

AWD modules generates a reset because of a timeout

(watchdog function).

High Temperature Reset

To prevent damage to the device, a reset will be initiated if

the temperature rises above a certain value. The reset is

maskable with bit HTRE in the Reset Mask Register. After a

reset the high temperature reset is disabled.

Low Voltage Reset

The LVR is related to the internal VDD. In case the voltage

falls below a certain threshold, it will pull down the RST_A pin.

High Voltage Reset

The HVR is related to the external VSUP voltage. In case

the voltage is above a certain threshold, it will pull down the

RST_A

pin. The reset is maskable with bit HVRE in the Reset

Mask Register. After a reset the high voltage reset is

disabled.

RESET EXTERNAL SOURCE

External Reset Pin

The microcontroller has the capability of resetting the

SMARTMOS device by pulling down the RST pin.

Reset Mask Register (RMR)

TTEST—High Temperature Reset Test

This read/write bit is for test purposes only. It decreases

the over-temperature shutdown limit for final test. Reset

clears the HTRE bit.

• 1 = Low temperature threshold enabled.

• 0 = Low temperature threshold disabled.

HVRE—High Voltage Reset Enable Bit

This read/write bit enables resets on high voltage

conditions. Reset clears the HVRE bit.

• 1 = High voltage reset enabled.

• 0 = High voltage reset disabled.

HTRE—High Temperature Reset Enable Bit

This read/write bit enables resets on high temperature

conditions. Reset clears the HTRE bit.

• 1 = High temperature reset enabled.

• 0 = High temperature reset disabled.

HTRE Flag

HVRE Flag

AWDRE Flag

AWD Reset

Sensor

High-Voltage

Reset Sensor

High-Temperature

Reset Sensor

MONO

FLOP

Low-Voltage Reset

VDD

RST_A

SPI REGISTERS

Bit7

Bit0

Read

TTEST

HVRE

HTRE

Write

Reset

908E626 Datasheet(PDF) 21 Page - Freescale Semiconductor, Inc

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