SH3100 datasheet(39/80 Pages) SEMTECH

39 / 80 page

SH3100

POWER MANAGEMENT

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Address(hex): 37

Description

(R/W) Configures the operation

of the INT pin

Default Value: 0000 0000

Reset Event: P, W, B

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Edge or Level

I2C ShortCode

Enable

Value at INT pin GPIO polarity GPIO Direction

Enable INT

Toggling

Interrupt or

GPIO

Bit No.

Description

Bit Value

Value Description

[6]

Edge or Level

When the INT pin is programmed as an interrupt by setting

InterruptOrGPIO to 1, the INT pin signals each interrupt as a

pulse with a duration of 4 CLK0 cycles

The INT pin drives to its active level (set by GPIOPolarity bit), and

remains until the interrupt is cleared by writing the relevant bit

in the InterruptStatus register. If toggling interrupts are

required, then this bit must be set to 1

[5]

I2CShortCodeEnable

Interrupts can only be cleared with a full-length I2C access.

All active interrupts are simultaneously cleared when a short-

form version of the I2C access is sent by the microcontroller.

This allows for substantially faster interrupt clearing

[4]

ValueAtINTPin

The INT pin is being driven externally or internally to 0

The INT pin is being driven externally or internally to 1

[3]

GPIOPolarity

If InterruptOrGPIO = 0 (GPIO), then INT pin is driven to 0. If

InterruptOrGPIO = 1 (Interrupt), then INT is hard-driven to 0

when the interrupt is active, but weak-pulled to 1 when inactive

If InterruptOrGPIO = 0 (GPIO), then INT pin is driven to 1. If

InterruptOrGPIO = 1 (Interrupt), then INT is hard-driven to 1

when the interrupt is active, but weak-pulled to 0 when inactive

[2]

GPIODirection

When InterruptOrGPIO = 0 (GPIO mode), INT pin is programmed

as a general-purpose input port

When InterruptOrGPIO = 0 (GPIO mode), INT pin is programmed

as a general-purpose output port

[1]

EnableINTToggling

All Active interrupts are signaled either by a 4 cycle pulse, or by

a fixed level, as determined by the EdgeOrLevel bit in this

The PIT toggles the INT pin at every activation. This can be used

to generate a very slow clock independent of CLK0 and CLK1,

with a period between 61 μs and 72 hours

In this mode all other interrupts operate normally, but may be

masked if the INT pin has been driven to the active state by a

PIT timeout

[0]

InterruptOrGPIO

INT pin is used as GPIO, with direction defined by GPIODirection

bit, and polarity set by GPIOPolarity bit.

INT pin is used to signal interrupts, and hard-drives to the active

level, weak-pull to the inactive level.

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