33912 datasheet(37/47 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33912

FUNCTIONAL DEVICE OPERATIONS

LOGIC COMMANDS AND REGISTERS

MOD2, MOD1 - Mode Control Bits

These write-only bits select the operating mode and allow

clearing the watchdog in accordance with Table 10 Mode

Control Bits.

Table 10. Mode Control Bits

Voltage Status Register - VSR

Returns the status of the several voltage monitors. This

VSOV - VSUP Over-Voltage

This read-only bit indicates an over-voltage condition on

the VS1 pin.

1 = Over-voltage condition.

0 = Normal condition.

VSUV - VSUP Under-Voltage

This read-only bit indicates an under-voltage condition on

the VS1 pin.

1 = Under-voltage condition.

0 = Normal condition.

VDDOT - Main Voltage Regulator Over-temperature

Warning

This read-only bit indicates that the main voltage regulator

temperature reached the Over-temperature Prewarning

Threshold.

1 = Over-temperature Prewarning

0 = Normal

BATFAIL - Battery Fail Flag.

This read-only bit is set during power-up and indicates that

the 33912 had a Power-On-Reset (POR).

Any access to the MCR or VSR will clear the BATFAIL flag.

1 = POR Reset has occurred

0 = POR Reset has not occurred

Wake-Up Control Register - WUCR

This register is used to control the digital wake-up inputs.

Writing the WUCR will return the Wake-Up Status Register

(WUSR).

Table 12. Wake-Up Control Register - $2

LxWE - Wake-up Input x Enable

This write-only bit enables/disables which Lx inputs are

enabled. In Stop and Sleep Mode the LxWE bit determines

which wake inputs are active for wake-up. If one of the Lx

inputs is selected on the analog multiplexer, the

corresponding LxWE is masked to 0.

1 = Wake-Up Input x enabled.

0 = Wake-Up Input x disabled.

Wake-Up Status Register - WUSR

This register is used to monitor the digital wake-up inputs

and is also returned when writing to the WUCR.

Lx - Wake-up input x

This read-only bit indicates the status of the corresponding

Lx input. If the Lx input is not enabled, then the according

Wake-Up status will return 0.

After a wake-up from Stop or Sleep Mode these bits also

allow to determine which input has caused the wake-up, by

first reading the Interrupt Status Register (ISR) and then

reading the WUSR.

1 = Lx Wake-up.

0 = Lx Wake-up disabled or selected as analog input.

MOD2

MOD1

Description

Normal Mode

Stop Mode

Sleep Mode

Normal Mode + Watchdog Clear

Table 11. Voltage Status Register - $0/$1

Read

VSOV

VSUV

VDDOT

BATFAIL

Write

L4WE

L3WE

L2WE

L1WE

Reset

Value

Reset

Condition

POR, Reset Mode or ext_reset

Table 13. Wake-Up Status Register - $2/$3

Read

33912 Datasheet(PDF) 37 Page - Freescale Semiconductor, Inc

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