User's Manual

User Manual
Version 01.00
2010-01-25
deRFmega128-22A001 and deRFmega128-22A021
dresden elektronik
ingenieurtechnik gmbh
Enno-Heidebroek-Str. 12
01237 Dresden
Tel.: 0351 – 31 85 00
Fax: 0351 – 3 18 50 10
[e-mail]
www.dresden-elektronik.de
Page 15 of 20
9. Onboard EEPROM
The deRFmega128-22A001 and deRFmega128-22A021 contains a Serial-TWI-EEPROM
with a memory size of 128k x 8Bit.
The EEPROM power supply and the pull-ups will be switch on with a LOW on port pin
PD6/T1. It is necessary to wait with communication on the data bus (PD1 and PD0) till the
TWI interface is initialized on the ATmega128RFA1.
Figure 9: Schematic of EEPROM