ATSTK525 Atmel, ATSTK525 Datasheet - Page 13

• Manufacturer Part Number: ATSTK525
• Description: KIT STARTER FOR AT90USB
• Manufacturer: Atmel

Specifications of ATSTK525

• Accessory Type: STK500 Expansion Module
• Processor To Be Evaluated: AT90USBxxx
• Data Bus Width: 8 bit
• Interface Type: RS-232, USB
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Silicon Core Number: AT90USB
• Kit Contents: Board Docs
• Rohs Compliant: Yes
• For Use With/related Products: AT90USB Devices
• For Use With: ATEVK525 - ADD ON KIT FOR STK525ATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

STK525 Hardware User Guide
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:
PD[7..0]
RS232 Interface
Hardware Flow Control
1. Tx reference: STK525 source, Rx reference: STK525 destination
(default configuration)
Software Data Flow
Optional
Control
Mode
PD2
PD3
PD1
PD0
SP4
SP5
C16
100nF
C17
100nF
RxD
T XD
CT S
RT S
12
11
10
1
3
4
5
9
U3
C1+
C1-
C2+
C2-
.
.
.
.
TTL
VCC
GND
VCC
RS 232
V+
V-
MAX3232
.
.
.
.
Configuration
Solder Pads
RS232 BUFFER
SP4: close
SP5: close
SP7: close
SP8: close
SP4: open
SP5: open
SP7: open
SP8: open
2
6
13
14
7
8
100nF
C19
100nF
RS-RxD
RS-T xD
RS-T xD
RS-T xD
RS-T xD
RS-T xD
RS-T xD
RS-T xD
RS-T xD
RS-CT S
RS-RT S
C18
SP7
SP8
1
6
2
7
3
8
4
9
5
Connection
Using the STK525
P1
SUB-D9 FEMALE
RS232
CTS
RTS
Rx
Rx
7608A–AVR–04/06
Tx
Tx
DB9
11
10
Pin 2
Pin 3
Pin 2
Pin 3
Pin 7
Pin 8
(1)
2-13