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ATmega32A Datasheet(PDF) 292 Page - ATMEL Corporation

Part # ATmega32A
Description  8-bit Microcontroller with 32K Bytes In-System Programmable Flash
PDF  352 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega32A Datasheet(HTML) 292 Page - ATMEL Corporation

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8155B–AVR–07/09
ATmega32A
Figure 26-17. Virtual Flash Page Load Register
26.10.12 Virtual Flash Page Read Register
The Virtual Flash Page Read Register is a virtual scan chain with length equal to the number of
bits in one Flash page plus 8. Internally the Shift Register is 8-bit, and the data are automatically
transferred from the Flash data page byte by byte. The first 8 cycles are used to transfer the first
byte to the internal Shift Register, and the bits that are shifted out during these 8 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.
Figure 26-18. Virtual Flash Page Read Register
26.10.13 Programming Algorithm
All references below of type “1a”, “1b”, and so on, refer to Table 26-15.
TDI
TDO
D
A
T
A
Flash
EEPROM
Fuses
Lock Bits
STROBES
ADDRESS
State
Machine
TDI
TDO
D
A
T
A
Flash
EEPROM
Fuses
Lock Bits
STROBES
ADDRESS
State
Machine



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