Hardware Description
2-8
AT89STK-03 Hardware User Guide
7609B–SCR–11/06
2.4.2
USB Peripheral
All the required hardware to develop a USB firmware is available and includes:
– a USB connector
– 2 test points D+ / D-
– a DETACH pushbutton which enables to connect / disconnect the pull-up on D+ and then to
simulate an USB Attach/Detach operation. This avoids removals and insertions of the USB
cable.
2.4.3
SPI
An SPI interface is available.
2.4.4
RS232
All the required hardware to manage a RS232C interface is available. Tx and Rx can be
connected to the LEDs (Rx and Tx) by means of SW28 and SW29 solder pads on solder
side of the board.
– 9 pin SUBD connector
– Transceiver MAX202
2.4.5
SIM Alternate Card
The following hardware is supplied:
– SIM connector
– power supply jumper
2.4.6
PLL Filter
1.
PLCC68 / VQFP64
PLL Filter is composed by C7, C10, R9
2.
PLCC28
PLL filter is composed by C25, R16, C26.
LED2
Green
General purpose led - Connected to P3.6 - Enabled by LED2 jumper or SW21
solder pad
LED3
Green
General purpose led - Connected to P3.7 - Enabled by LED3 jumper or SW22
solder pad
LED4
Green
General purpose led - Connected to P4.3 (Only on PLCC68 / VQFP64 packages)
- Enabled by LED4 jumper
LED5
Green
General purpose led - Connected to P4.4 (Only on PLCC68 / VQFP64 packages)
- Enabled by LED5 jumper
LED6
Green
General purpose led - Connected to P4.5 (Only on PLCC68 / VQFP64 packages)
- Enabled by LED6 jumper or SW25 solder pad
TX
Green
Serial Transmission Line Status - Connected to TXD / P3.1 - Enabled by SW28
solder pad
RX
Red
Serial Reception Line Status - Connected to RXD / P3.0 - Enabled by SW29
solder pad
Name
Color
Description
SIM PWR
5V power supply
3.3V power supply
5V
3.3V
5V
3.3V