CP3BT13 datasheet(6/232 Pages) NSC

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uling upon reception. In addition, a time stamp counter (16-

bits wide) is provided to support real time applications.

The CAN module is a fast core bus peripheral, which allows

single cycle byte or word read/write access. A set of diag-

nostic features (such as loopback, listen only, and error

identification) support the development with the CAN mod-

ule and provide a sophisticated error management tool.

The CAN receiver can trigger a wake-up condition out of the

low-power modes through the Multi-Input Wake-Up module.

3.16

ACCESS.BUS INTERFACE

The ACCESS.bus interface module (ACB) is a two-wire se-

rial interface with the ACCESS.bus physical layer. It is also

compatible with Intel’s System Management Bus (SMBus)

and Philips’ I2C bus. The ACB module can be configured as

a bus master or slave, and can maintain bidirectional com-

munications with both multiple master and slave devices.

The ACCESS.bus receiver can trigger a wake-up condition

out of the low-power modes using the Multi-Input Wake-Up

module.

3.17

DMA CONTROLLER

The Direct Memory Access Controller (DMAC) can speed

up data transfer between memory and I/O devices or be-

tween two memories, relative to data transfers performed di-

rectly by the CPU. A method called cycle-stealing allows the

CPU and the DMAC to use the core bus in parallel. The

DMAC implements four independent DMA channels. DMA

requests from a primary and a secondary source are recog-

nized for each DMA channel, as well as a software DMA re-

quest issued directly by the CPU. Table 1 shows the DMA

channel assignment on the CP3BT13 architecture. The fol-

lowing on-chip modules can assert a DMA request to the

DMAC:

CR16C (Software DMA request)

UART

Advanced Audio Interface

CVSD/PCM Converter

Table 1 shows how the four DMA channels are assigned

to the modules listed above.

Table 1

DMA Channel Assignment

3.18

ADVANCED AUDIO INTERFACE

The audio interface provides a serial synchronous, full-du-

plex interface to CODECs and similar serial devices. Trans-

mit and receive paths operate asynchronously with respect

to each other. Each path uses three signals for communica-

tion: shift clock, frame synchronization, and data.

In case receive and transmit use separate shift clocks and

frame sync signals, the interface operates in its asynchro-

nous mode. Alternatively, the transmit and receive path can

share the same shift clock and frame sync signals for syn-

chronous mode operation.

The interface can handle data words of either 8- or 16-bit

length and data frames can consist of up to four slots.

In the normal mode of operation, the interface only transfers

one word at a periodic rate. In the network mode, the inter-

face transfers multiple words at a periodic rate. The periodic

rate is also called a data frame and each word within one

frame is called a slot. The beginning of each new data frame

is marked by the frame sync signal.

3.19

CVSD/PCM CONVERSION MODULE

The CVSD/PCM module performs conversion between

CVSD data and PCM data, in which the CVSD encoding is

as defined in the Bluetooth specification 1.0 and the PCM

data can be 8-bit µ-Law, 8-bit A-Law, or 13-bit to 16-bit Lin-

ear.

3.20

SERIAL DEBUG INTERFACE

The Serial Debug Interface module (SDI module) provides

a JTAG-based serial link to an external debugger, for exam-

ple running on a PC. In addition, the SDI module integrates

an on-chip debug module, which allows the user to set up to

four hardware breakpoints on instruction execution and data

transfer. The SDI module can act as a CPU bus master to

access all memory mapped resources, such as RAM and

peripherals. Therefore it also allows for fast program code

download into the on-chip Flash program memory using the

JTAG interface.

3.21

DEVELOPMENT SUPPORT

In addition to providing the features needed for the next gen-

eration of embedded Bluetooth products, the CP3BT13 is

backed up by the software resources designers need for

rapid time-to-market, including an operating system, Blue-

tooth protocol stack implementation, peripheral drivers, ref-

erence

designs,

and

integrated

development

environment. Combined with National’s LMX5252 Bluetooth

radio transceiver, the CP3BT13 provides a total Bluetooth

system solution.

National Semiconductor offers a complete and industry-

proven application development environment for CP3BT13

applications, including the IAR Embedded Workbench,

iSYSTEM winIDEA and iC3000 Active Emulator, Bluetooth

Development Board, Bluetooth Protocol Stack, and Applica-

tion Software. See your National Semiconductor sales rep-

resentative for current information on availability and

features of emulation equipment and evaluation boards.

Channel

Primary/

Secondary

Peripheral

Transaction

Primary

Reserved

Read/Write

Secondary

UART

Read

Primary

UART

Write

Secondary

Unused

N/A

Primary

AAI

Read

Secondary

CVSD/PCM

Read

Primary

AAI

Write

Secondary

CVSD/PCM

Write

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