ATtiny5 datasheet(107/168 Pages) ATMEL

107 / 168 page

107

8127C–AVR–10/09

ATtiny4/5/9/10

15. Memory Programming

15.1 Features

• Two Embedded Non-Volatile Memories:

– Non-Volatile Memory Lock bits (NVM Lock bits)

– Flash Memory

• Four Separate Sections Inside Flash Memory:

– Code Section (Program Memory)

– Signature Section

– Configuration Section

– Calibration Section

• Read Access to All Non-Volatile Memories from Application Software

• Read and Write Access to Non-Volatile Memories from External programmer:

– Read Access to All Non-Volatile Memories

– Write Access to NVM Lock Bits, Flash Code Section and Flash Configuration Section

• External Programming:

– Support for In-System and Mass Production Programming

– Programming Through the Tiny Programming Interface (TPI)

• High Security with NVM Lock Bits

15.2 Overview

The Non-Volatile Memory (NVM) Controller manages all access to the Non-Volatile Memories.

The NVM Controller controls all NVM timing and access privileges, and holds the status of the

NVM.

During normal execution the CPU will execute code from the code section of the Flash memory

(program memory). When entering sleep and no programming operations are active, the Flash

memory is disabled to minimize power consumption.

All NVM are mapped to the data memory. Application software can read the NVM from the

mapped locations of data memory using load instruction with indirect addressing.

The NVM has only one read port and, therefore, the next instruction and the data can not be

read simultaneously. When the application reads data from NVM locations mapped to the data

space, the data is read first before the next instruction is fetched. The CPU execution is here

delayed by one system clock cycle.

Internal programming operations to NVM have been disabled and the NVM therefore appears to

the application software as read-only. Internal write or erase operations of the NVM will not be

successful.

The method used by the external programmer for writing the Non-Volatile Memories is referred

to as external programming. External programming can be done both in-system or in mass pro-

duction. See Figure 14-2 on page 97. The external programmer can read and program the NVM

via the Tiny Programming Interface (TPI).

In the external programming mode all NVM can be read and programmed, except the signature

and the calibration sections which are read-only.

NVM can be programmed at 5V, only.

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