Maxim-integrated 78Q8430 Software Driver Manual do Utilizador descarregar pdf (Página 43)

UG_8430_004 78Q8430 Software Driver Development Guidelines

Rev. 1.0 43

8 EEPROM Operations

The 78Q8430 provides logic for reading and writing an optional external EEPROM or ROM device. Refer

to the 78Q8430 Data Sheet for supported devices. EEPROM Erase, Write, and Read procedures are

described in this section.

8.1 EEPROM Erase

Use the following procedure to erase the EEPROM:

STEP 1: Write to PRCR.

Fill the PRCR Operation field with the Erase command (b11) and set the PRCR Busy bit.

STEP 3: Read PRCR.

STEP 4: Repeat STEP 3 until the PRCR Busy bit is clear.

8.2 EEPROM Write Access

Use the following procedure to write a value to the EEPROM:

STEP 1: Write the data to PRDR.

Write the desired data to the lower 16 bits of PRDR.

STEP 2: Write to PRCR.

Fill the PRCR PROM Addr field with the EEPROM address to write. Fill the Operation field with the

Write command (b01) and set the Busy bit.

STEP 3: Read PRCR.

STEP 4: Repeat STEP 3 until the PRCR Busy bit is clear.

8.3 EEPROM Read Access

Use the following procedure to read a value from the EEPROM:

STEP 1: Write to PRCR.

Fill the PRCR PROM Addr field with the EEPROM address to read. Fill the Operation field with the

Read command (b10) and set the Busy bit.

STEP 2: Read PRCR.

STEP 3: Repeat STEP 3 until the PRCR Busy bit is clear.

STEP 4: Read the EEPROM value from PRDR.

The EEPROM data will be in the lower 16 bits.

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 53 54

Sem comentários

Maxim-integrated 78Q8430 Software Driver Manual do Utilizador Página 43