Information

I
2
C Interface
MPC8308 PowerQUICC II Pro Processor Reference Manual, Rev. 1
Freescale Semiconductor 17-19
Figure 17-9. EEPROM Contents
• A preamble should be the first 3 bytes programmed into the EEPROM. It should have a value of
0xAA_55AA. The I
2
C checks to ensure that this preamble is correctly detected before proceeding.
• Following the preamble, there should be a series of configuration registers (known as register
preloads). Each configuration register should be programmed according to a particular format, as
shown in Figure 17-10.
ACS BYTE_EN 1 ADDR[12–13]
Second
Configuration
Preload Command
ADDR[14–21]
ADDR[22–29]
DATA[0–7]
DATA[8–15]
DATA[16–23]
DATA[24–31]
................
ACS BYTE_EN 1 ADDR[12–13]
Last Configuration
Preload Command
ADDR[14–21]
ADDR[22–29]
DATA[0–7]
DATA[8–15]
DATA[16–23]
DATA[24–31]
00000000
End Command
00000000
00000000
CRC[0–7]
CRC[8–15]
CRC[16–23]
CRC[24–31]