Unlock Microcontroller ATMEGA164PA Eeprom

We can Unlock Microcontroller ATMEGA164PA Eeprom, please view the Microcontroller ATMEGA164PA features for your reference:

Note that the XMEM interface is asynchronous and that the waveforms in the following figures are related to the internal system clock when unlock microcontroller eeprom.

The skew between the internal and external clock (XTAL1) is not guarantied (varies between devices temperature, and supply voltage). Consequently, the XMEM interface is not suited for synchronous operation if unlock microcontroller eeprom.

Writing SRE to one enables the External Memory Interface.The pin functions AD7:0, A15:8, ALE, WR, and RD are activated as the alternate pin functions. The SRE bit overrides any pin direction settings in the respective data direction registers before unlock microcontroller eeprom.

Writing SRE to zero, disables the External Memory Interface and the normal pin and data direction settings are used. It is possible to configure different wait-states for different External Memory addresses after unlock microcontroller eeprom.

The external memory address space can be divided in two sectors that have separate wait-state bits. The SRL2, SRL1, and SRL0 bits select the split of the sectors, see Table 4 and Figure 14. By default, the SRL2, SRL1, and SRL0 bits are set to zero and the entire external memory address space is treated as one sector when unlock microcontroller eeprom.

When the entire SRAM address space is configured as one sector, the wait-states are configured by the SRW11 and SRW10 bits. The SRW11 and SRW10 bits control the number of wait-states for the upper sector of the external memory address space if unlock microcontroller eeprom.

The SRW01 and SRW00 bits control the number of wait-states for the lower sector of the external memory address space, Writing XMBK to one enables the bus keeper on the AD7:0 lines before unlock microcontroller eeprom.

When the bus keeper is enabled, AD7:0 will keep the last driven value on the lines even if the XMEM interface has tri-stated the lines. Writing XMBK to zero disables the bus keeper. XMBK is not qualified with SRE, so even if the XMEM interface is disabled, the bus keepers are still activated as long as XMBK is one after unlock microcontroller eeprom.

 


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