Table of Contents
Advertisement
STK511 Receiver Interface Board
4.2.7
Receive Signal Routing
Two signals from the Receiver Application Board are routed to the STK511 Receiver Interface Board on-
board microcontroller, to allow for operation as a stand-alone system, while the rest are routed to the
STK500. Provisions have been made for re-routing all the signals from the receiver to either the STK511
Receiver Interface Board or the STK500 boards. For the advanced user, this flexibility could be used to
realize a complete stand-alone receiver system. The routing is controlled by selective population of 0-Ω
resistors on the back of the STK511 Receiver Interface Board. The following table lists the routing
choices. Components shown in bold designate how the STK511 Receiver Interface Board is configured
as shipped. To change the signal routing, remove/add the appropriate resistors.
Table 4-3. Receiver Signal Routing
4.3
Software Description
4.3.1
Overview
The firmware supplied with the STK511 Receiver Interface Board performs the following functions:
Clears the Reset Marker upon power up
Reads the values set by the configuration register DIP switches
Programs the OPMODE and LIMIT registers via the bi-directional DATA line
Holds the receiver in a polling mode via the POL/ON line
Many Atmel receivers generate a Reset Marker signal, consisting of a 128 kHz square wave, upon
power up. This must be cleared before normal operation can occur. Applying a 10 ms low pulse to the
DATA line clears the Reset Marker. This function is part of the initialization routine of the STK511
Receiver Interface Board firmware. However, the DATA selector switch must be set to STK511 mode
during power up for this to occur.
4-6
4842B–AVR–10/09
Pin #
ATA5743
12
VCC
11
GND
10
DATA
9
8
N/A
7
MODE
6
D_CLK
5
SENS
4
IC_Active
3
POL/ON
2
1
U2
ATA5760/1
ATA5744
VCC
GND
DATA
DATA
N/A
V DIV
D_CLK
RSSI
SENS
IC_ACTIVE
POL/ON
ENABLE
Routing to
On-board
Microcontroller
VCC
GND
DATA Selector Switch
BR0
R32 - NC
R28 - 0 Ω
BR1
R26 - NC
N/A
R32 - NC
R29 - 0 Ω
Routing to
STK500 Board
R31 - 0 Ω
R27 - NC
R25 - 0 Ω
R31 - 0 Ω
R30 - NC
STK511 User Guide
Advertisement
Table of Contents
Need help?
Do you have a question about the STK511 and is the answer not in the manual?
Questions and answers