ADSP-21469KBZ-ENG2 datasheet(47/56 Pages) AD

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ADSP-21469/ADSP-21469W

Preliminary Technical Data

Rev. PrB

Page 47 of 56

November 2008

Universal Asynchronous Receiver-Transmitter

(UART) Port—Receive and Transmit Timing

Figure 36 describes UART port receive and transmit operations.

The maximum baud rate is PCLK/16 where PCLK = 1/tPCLK.

As shown in Figure 36 there is some latency between the gener-

ation of internal UART interrupts and the external data

operations. These latencies are negligible at the data transmis-

sion rates for the UART.

Table 44. UART Port

Parameter

Min

Max

Unit

Timing Requirement

tRXD

Incoming Data Pulse Width

TBD

Switching Characteristic

TBD

tTXD1

Outgoing Data Pulse Width

TBD

1 UART signals RXD and TXD are routed through DPI P14-1 pins using the SRU.

Figure 36. UART Port—Receive and Transmit Timing

DPI_P14

-1

[RXD]

DATA(5

-8)

INTERNAL

UART RECEIVE

INTERRUPT

UART RECEIVE BIT SET BY DATA STOP;

CLEARED BY FIFO READ

DPI_P14

-1

[TXD]

DATA(5

-8)

STOP(1

-2)

INTERNAL

UART TRANSMIT

INTERRUPT

UART TRANSMIT BIT SET BY PROGRAM;

CLEARED BY WRITE TO TRANSMIT

START

STOP

TRANSMIT

RECEIVE

tRXD

tTXD

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