Phytec phyCORE-MPC5200B tiny, Hardware Manual

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System Memory
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PHYTEC Messtechnik GmbH 2006 L-678e_0
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6.3 Serial Memory
The phyCORE-MPC5200B tiny features a non-volatile memory
device (EEPROM) with a serial I
2
C interface. This memory can be
used for storage of configuration data or operating parameters that
must be maintained in the event of a power interruption. The available
capacity is 4 kByte.
Note:
The first 2 kilobytes section of the EEPROM is already used for
storing the boot manager (U-Boot) environment variables. This
portion must not be used by user data.
The MPC5200B processor provides two on-chip I
2
C interfaces. The
memory device is connected to I²C interface #2.
Table 7 gives an overview of the possible devices for use at U4 as of
the printing of this manual.
Type Size I
2
C
Frequency
Address
Pins Write
Cycles Life of
Data Device Manufacturer
EEPROM 4 kBytes 400 kHz A2, A1,
A0 1 000
000 100
yrs. CAT24WC32 CATALYST
Table 7: Serial Memory Options for U4
It is important to note that the RTC U5 is also connected to the I
2
C #2
bus. The RTC can operate with a bus frequency up to 400 kHz.
Therefore the use of high bus frequencies for accessing the serial
memory is not recommended. The RTC has the I
2
C bus slave address
0xA2 / 0xA3. The slave address of the serial memory must be selected
accordingly using solder jumpers J5 (A1) and J6 (A2) to avoid bus
collision. The address input A0 is hard-wired to GND.