ATMEGA64L-8MI View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA64L-8MI

8-bit AVR® Microcontroller with 64K Bytes In-System Programmable Flash

Atmel Corporation 

Virtual Flash Page Load

Register

ATmega64(L)

The Virtual Flash Page Load Register is a virtual scan chain with length equal to the

number of bits in one Flash page. Internally the Shift Register is 8-bit, and the data are

automatically transferred to the Flash page buffer byte-by-byte. Shift in all instruction

words in the page, starting with the LSB of the first instruction in the page and ending

with the MSB of the last instruction in the page. This provides an efficient way to load the

entire Flash page buffer before executing Page Write.

Figure 153. Virtual Flash Page Load Register

State

Machine

STROBES

ADDRESS

Flash

TDI

EEPROM

Fuses

Lock Bits

D

A

T

A

Virtual Flash Page Read

Register

TDO

The Virtual Flash Page Read Register is a virtual scan chain with length equal to the

number of bits in one Flash page plus eight. Internally the Shift Register is 8-bit, and the

data are automatically transferred from the Flash data page byte-by-byte. The first eight

cycles are used to transfer the first byte to the internal Shift Register, and the bits that

are shifted out during these eight cycles should be ignored. Following this initialization,

data are shifted out starting with the LSB of the first instruction in the page and ending

with the MSB of the last instruction in the page. This provides an efficient way to read

one full Flash page to verify programming.

2490G–AVR–03/04

321

Share Link: