33910 datasheet(80/90 Pages) FREESCALE

80 / 90 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

33910

FUNCTIONAL DEVICE OPERATIONS

LOGIC COMMANDS AND REGISTERS

MC33910BAC / MC34910BAC

MOD2, MOD1 - Mode Control Bits

These write-only bits select the Operating mode and allow

to clear the watchdog in accordance with Table 38 Mode

Control Bits.

Table 40. 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 33910 had a power on reset (POR).

Any access to the MCR or voltage status register (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 input.

Writing the wake-up control register (WUCR) will return the

wake-up status register (WUSR).

Table 42. Wake-up Control Register - $2

L1WE - Wake-up Input Enable

This write-only bit enables/disables the L1 input. In Stop

and Sleep mode the L1WE bit activates the L1 input for wake-

up. If the L1 input is selected on the analog multiplexer, the

L1WE is masked to 0.

1 = Wake-up Input enabled.

0 = Wake-up Input 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 wake-up control

L1 - Wake-up input

This read-only bit indicates the status of the L1 input. If the

L1 input is not enabled then the wake-up status will return 0.

After a wake-up form Stop or Sleep mode this bit also

allows to verify the L1 input has caused the wake-up, by first

reading the interrupt status register (ISR) and then reading

the wake-up status register (WUSR).

1 = L1 Wake-up.

0 = L1 Wake-up disabled or selected as analog input.

MOD2

MOD1

Description

Normal Mode

Stop Mode

Sleep Mode

Normal Mode + watchdog Clear

Table 41. Voltage Status Register - $0/$1

Read

VSOV

VSUV

VDDOT

BATFAIL

Write

L1WE

Reset

Value

1111

Reset

Condition

POR, Reset mode or ext_reset

Table 43. Wake-up Status Register - $2/$3

Read

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