ADUCM4050BCBZ-R7 datasheet(32/46 Pages) AD

32 / 46 page

ADuCM4050

Data Sheet

Rev. A | Page 32 of 46

CRC Accelerator

The CRC accelerator computes the CRC for a block of memory

locations, that can be in the SRAM, flash, or any combination of

MMRs. The CRC accelerator generates a checksum that can be

compared with an expected signature. The main features of the

CRC include the following:

•

Generates a CRC signature for a block of data.

•

Supports programmable polynomial length of up to 32 bits.

•

Operates on 32 bits of data at a time, and generates CRC

for any data length.

•

Supports MSB first and LSB first CRC implementations.

•

Various data mirroring capabilities.

•

Initial seed to be programmed by user.

•

DMA controller (memory to memory transfer) used for

data transfer to offload the MCU.

Programmable GPIOs

The ADuCM4050 MCU has 44 and 51 GPIO pins in the LFCSP

and WLCSP packages, respectively, with multiple, configurable

functions defined by user code. They can be configured as

input/output pins and have programmable pull-up resistors. All

GPIO pins are functional over the full supply range. In deep

sleep modes, GPIO pins retain their state. On reset, they tristate.

Timers

The ADuCM4050 MCU contains three general-purpose timers,

a watchdog timer, and an RGB timer. All timers support event

capture feature, where they can take 40 different interrupts.

General-Purpose Timers

The ADuCM4050 MCU has three identical general-purpose

timers, each with a 16-bit up or down counter. The up or down

counter can be clocked from one of four user-selectable clock

sources. Any selected clock source can be scaled down using a

prescaler of 1, 16, 64, or 256.

Watchdog Timer (WDT)

The watchdog timer (WDT) is a 16-bit count down timer with a

programmable prescaler. The prescaler source is selectable and

can be scaled by a factor of 1, 16, or 256. The WDT is clocked by

the 32 kHz on-chip oscillator (LFOSC) and helps recover from

an illegal software state. The WDT requires periodic servicing

to prevent it from forcing a reset or interrupt to the MCU.

RGB Timer

The ADuCM4050 MCU has an RGB timer that supports a

common anode RGB LED. It has a timer counter and three

compare registers. It can generate three distinct pulse width

modulation (PWM) waveforms on three GPIO pins

simultaneously so different colors can be realized using a

common anode RGB LED.

When the RGB timer is in operation, the other three timers are

available for user software.

ADC Subsystem

The ADuCM4050 MCU integrates a 12-bit SAR ADC with up

to eight external channels. Conversions can be performed in

single or autocycle mode. In single mode, the ADC can be

configured to convert on a particular channel by selecting one

of the ADC channels. Autocycle mode is provided to convert

over multiple channels with reduced MCU overhead of

sampling and reading individual channel registers. The ADC

can also be used for temperature sensing and measuring battery

voltage using the ADC channels.

Temperature sensing and battery monitoring cannot be

included in autocycle mode.

The digital comparator on the device allows an interrupt to be

triggered if ADC input is above or below a programmable

threshold. Use the following GPIO multiplexed channels with

the digital comparator (see the GPIO Multiplexing section):

ADC0_VIN0, ADC0_VIN1, ADC0_VIN2, and ADC0_VIN3.

Use the ADC in DMA mode to reduce MCU overhead by

moving ADC results directly into SRAM with a single interrupt

asserted when the required number of ADC conversions

completely logs to memory. The main features of the ADC

subsystem include the following:

•

12-bit resolution.

•

Programmable ADC update rate from 10 kSPS to

1.8 MSPS.

•

Integrated input mux that supports up to eight channels.

•

Temperature sensing support.

•

Battery monitoring support.

•

Software selectable on-chip reference voltage generation—

1.25 V or 2.50 V.

•

Software-selectable internal or external reference.

•

Autocycle mode provides the ability to automatically select

a sequence of input channels for conversion.

•

Multiple conversions over a single channel or multiple

channels can be performed without core interruption.

•

Averaging function—converted data on a single channel or

multiple channels can be averaged up to 256 samples.

•

Alert function that contains an internal digital comparator

for the ADC0_VIN0, ADC0_VIN1, ADC0_VIN2, and

ADC0_VIN3 channels. An interrupt is generated if the

digital comparator detects an ADC result above or below a

user defined threshold. In addition, up to eight cycles of

hysteresis are built in.

•

Dedicated DMA channel support.

•

Each channel, including temperature sensor and battery

monitoring, has a data register for conversion result.

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