ADUCM3027BCPZ-R7 datasheet(28/39 Pages) AD

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ADuCM3027/ADuCM3029

Data Sheet

Rev. B | Page 28 of 39

Beeper Driver

The ADuCM3027/ADuCM3029 MCUs have an integrated

audio driver for a beeper.

The beeper driver module in the ADuCM3027/ADuCM3029

MCUs generate a differential square wave of programmable

frequency. It drives an external piezoelectric sound component

with two terminals that connect to the differential square wave

output.

The beeper driver consists of a module that can deliver

frequencies ranging from 8 kHz to approximately 0.25 kHz; the

minimum frequency is determined by the maximum value of a

divide register that can be programmed to 127. This results in a

beeper frequency of

32.768 kHz/127 = 0.25802 kHz

The beeper driver allows programmable tone durations in 4 ms

increments. Pulse (single-tone) and sequence (multitone)

modes provide versatile playback options.

In sequence mode, the beeper can be programmed to play any

number of tone pairs from 1 to 254 (2 tones to 508 tones) or be

programmed to play forever (until stopped by the user).

Interrupts are available to indicate the start or end of any beep,

the end of a sequence, or when the sequence is nearing

completion.

Debug Capability

The ADuCM3027/ADuCM3029 MCUs support SWD. The

ADuCM3027/ADuCM3029 MCUs have a reduced flash patch

and breakpoint (FPB) unit with support for up to two hardware

breakpoints.

ON-CHIP PERIPHERAL FEATURES

The ADuCM3027/ADuCM3029 MCUs have a rich set of

peripherals connected to the core via several concurrent high

bandwidth buses, providing flexibility in system configuration

as well as excellent overall system performance (see Figure 1).

The ADuCM3027/ADuCM3029 MCUs contain high speed

serial ports, an interrupt controller for flexible management of

interrupts from the on-chip peripherals or external sources, and

power management control functions to tailor the performance

and power characteristics of the MCU and system to many

application scenarios.

Serial Ports (SPORT)

The ADuCM3027/ADuCM3029 MCUs provide two single

direction half SPORTs or one bidirectional full SPORT. The

synchronous serial ports provide an inexpensive interface to a

wide variety of digital and mixed-signal peripheral devices such

as Analog Devices audio codecs, ADCs, and DACs. The serial

ports contain two data lines, a clock, and a frame sync. The data

lines can be programmed to either transmit or receive, and each

data line has a dedicated DMA channel.

Serial port data can be automatically transferred to and from

on-chip memory or external memory via dedicated DMA

channels. The frame sync and clock can be shared. Some of the

ADCs and DACs require two control signals for their

conversion process. To interface with such devices, the

SPT0_ACNV and SPT0_BCNV signals are provided. To use

these signals, enable the timer enable mode. In this mode, a

PWM timer inside the module generates the programmable

SPT0_ACNV and SPT0_BCNV signals.

Serial ports operate in two modes:

•

Standard digital signal processor (DSP) serial mode

•

Timer enable mode

SPI Ports

The ADuCM3027/ADuCM3029 MCUs provide three SPIs. SPI

is an industry standard, full-duplex, synchronous serial inter-

face that allows eight bits of data to be synchronously

transmitted and simultaneously received. Each SPI incorporates

two DMA channels that interface with the DMA controller. One

DMA channel transmits and the other receives. The SPI on the

MCU eases interfacing to external serial flash devices.

The SPI features include the following:

•

Serial clock phase mode and serial clock polarity mode

•

Loopback mode

•

Continuous and repeated transfer mode

•

Wired OR output mode

•

Read command mode for half-duplex operation (transmit

followed by receive)

•

Flow control support in read command mode

•

Support for 3-pin SPI in read command mode

•

Multiple CS line support

•

CS software override support

UART Port

The ADuCM3027/ADuCM3029 MCUs provide a full-duplex

UART port, which is fully compatible with PC standard UARTs.

The UART port provides a simplified UART interface to other

peripherals or hosts, supporting full-duplex, DMA, and

asynchronous transfers of serial data. The UART port includes

support for five to eight data bits, and none, even, or odd parity.

A frame is terminated by one, one and a half, or two stop bits.

I2C

The ADuCM3027/ADuCM3029 MCUs provide an I2C bus

peripheral that has two pins for data transfer. SCL (Pin P0_04)

is a serial clock pin, and SDA (Pin P0_05) is a serial data pin.

The pins are configured in a wired AND format that allows

arbitration in a multimaster system. A master device can be

configured to generate the serial clock. The frequency is

programmed by the user in the serial clock divisor register. The

master channel can operate in fast mode (400 kHz) or standard

mode (100 kHz).

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