ATA6613 ATMEL Corporation, ATA6613 Datasheet - Page 47
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ATA6613
Manufacturer Part Number
ATA6613
Description
Ata6613
Manufacturer
ATMEL Corporation
Datasheet
1.ATA6613.pdf
(362 pages)
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9111C–AUTO–02/08
Table 6-3.
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.
Symbol
EEPROM write
(from CPU)
• Bit 0 – EERE: EEPROM Read Enable
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.
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.
programming time for EEPROM access from the CPU.
EEPROM Programming Time
Number of Calibrated RC Oscillator Cycles
26,368
ATA6612/ATA6613
Table 6-3
Typ Programming Time
3.3 ms
lists the typical
47
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