ATA6602 datasheet(44/362 Pages) ATMEL

Part #	ATA6602

Description	Microcontroller with LIN Transceiver, 5V Regulator and Watchdog

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Manufacturer	ATMEL [ATMEL Corporation]

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4921C–AUTO–01/07

ATA6602/ATA6603

When the write access time has elapsed, the EEPE bit is cleared by hardware. The user

software can poll this bit and wait for a zero before writing the next byte. When EEPE has

been set, the CPU is halted for two cycles before the next instruction is executed.

• Bit 0 – EERE: EEPROM Read Enable

The EEPROM Read Enable Signal EERE is the read strobe to the EEPROM. When the cor-

rect address is set up in the EEAR Register, the EERE bit must be written to a logic one to

trigger the EEPROM read. The EEPROM read access takes one instruction, and the

requested data is available immediately. When the EEPROM is read, the CPU is halted for

four cycles before the next instruction is executed.

The user should poll the EEPE bit before starting the read operation. If a write operation is in

progress, it is neither possible to read the EEPROM, nor to change the EEAR Register.

The calibrated Oscillator is used to time the EEPROM accesses. Table 4-3 lists the typical

programming time for EEPROM access from the CPU.

The following code examples show one assembly and one C function for writing to the

EEPROM. The examples assume that interrupts are controlled (e.g. by disabling interrupts glo-

bally) so that no interrupts will occur during execution of these functions. The examples also

assume that no Flash Boot Loader is present in the software. If such code is present, the

EEPROM write function must also wait for any ongoing SPM command to finish.

Table 4-3.

EEPROM Programming Time

Symbol

Number of Calibrated RC Oscillator Cycles

Typ Programming Time

EEPROM write

(from CPU)

26,368

3.3 ms

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