STK525 datasheet(13/39 Pages) ATMEL

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Using the STK525

STK525 Hardware User Guide

2-13

7608A–AVR–04/06

The STK525 USART implementation allows an optional hardware flow control that can

be enabled thanks to SP4, SP5, SP7, SP8 solder pads (See Figure 2-11).

Figure 2-11 . USART Schematic

Table 2-3 . UART Settings

Note:

1. Tx reference: STK525 source, Rx reference: STK525 destination

Mode

Solder Pads

Configuration

DB9

Connection

(1)

Software Data Flow

Control

(default configuration)

SP4: open

SP5: open

SP7: open

SP8: open

Pin 2

Pin 3

Optional

Hardware Flow Control

SP4: close

SP5: close

SP7: close

SP8: close

CTS

RTS

Pin 2

Pin 3

Pin 7

Pin 8

SUB-D9 FEMALE

RS232

RS232 Interface

RS-CT S

VCC

CT S

RT S

C1+

V+

C1-

C2+

C2-

V-

RS 232

TTL

GND

VCC

MAX3232

RS232 BUFFER

C17

100nF

C16

100nF

C18

100nF

C19

100nF

RxD

PD2

RS-T xD

RS-RxD

PD[7..0]

SP4

SP5

PD1

PD0

PD3

T XD

SP7

SP8

RS-RT S

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