dresden elektronik ingenieurtechnik gmbh MEGA22M00 사용자 설명서
User Manual
Version 1.1c
2013-07-01
Version 1.1c
2013-07-01
OEM
radio modules deRFmega
www.dresden-elektronik.de
Page 42 of 52
10. Application circuits
10.1. UART
Two U(S)ART interfaces are available on the radio modules. For communication to a host
with a different supply voltage domain it is necessary to use a level-shifter. We recommend
the USB level shifter by dresden elektronik. The level-shifter can be connected to the custom
base board via 100 mil 2 x 3 pin header. The pin assignment should be designed as below in
Figure 36. For an UART connection it is sufficient to use only TXD, RXD and GROUND
signals.
with a different supply voltage domain it is necessary to use a level-shifter. We recommend
the USB level shifter by dresden elektronik. The level-shifter can be connected to the custom
base board via 100 mil 2 x 3 pin header. The pin assignment should be designed as below in
Figure 36. For an UART connection it is sufficient to use only TXD, RXD and GROUND
signals.
1. PE1/TXD0
2. VCC
3. Not connected
4. PE0/RXD0
5. Not connected
6. GND
2. VCC
3. Not connected
4. PE0/RXD0
5. Not connected
6. GND
Figure 36: 100 mil 2 x 3 pin header for UART0
10.2. ISP
The AVR based radio modules can be programmed via JTAG and ISP interface. For ISP
connections a 100 mil 2 x 3 pin header should be used. The pin assignment is given in
Figure 37. The MCU ATmega128RFA1 uses the ISP signals PDO and PDI on the same pins
like the SPI with MISO and MOSI.
connections a 100 mil 2 x 3 pin header should be used. The pin assignment is given in
Figure 37. The MCU ATmega128RFA1 uses the ISP signals PDO and PDI on the same pins
like the SPI with MISO and MOSI.
We recommend the use of an ‘AVR ISP programmer’.
1. PB3/MISO/PDO
2. VCC
3. PB1/SCK
4. PB2/MOSI/PDI
5. RSTN
6. GND
2. VCC
3. PB1/SCK
4. PB2/MOSI/PDI
5. RSTN
6. GND
Figure 37: 100 mil 2x3 pin header for ISP
10.3. JTAG
The AVR based radio modules can be programmed via JTAG and ISP interface. For JTAG
connections a 100 mil 2 x 5 pin header should be used. The pin assignment is given in
Figure 38. We recommend the
connections a 100 mil 2 x 5 pin header should be used. The pin assignment is given in
Figure 38. We recommend the
use of ‘Atmel AVR Dragon’ or ‘Atmel JTAG ICE mkII’
programmer.
1. PF4/TCK
2. GND
3. PF6/TDO
4. VCC
5. PF5/TMS
6. RSTN
7. VCC
8. Not connected
9. PF7/TDI
10. GND
2. GND
3. PF6/TDO
4. VCC
5. PF5/TMS
6. RSTN
7. VCC
8. Not connected
9. PF7/TDI
10. GND
Figure 38: 100 mil 2x5 pin header for JTAG