ATMEGA323-8AC Atmel, ATMEGA323-8AC Datasheet - Page 209
![IC AVR MCU 32K 8MHZ COM 44TQFP](/photos/6/70/67042/313-44-tqfp_sml.jpg)
ATMEGA323-8AC
Manufacturer Part Number
ATMEGA323-8AC
Description
IC AVR MCU 32K 8MHZ COM 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA323L-4PC.pdf
(247 pages)
Specifications of ATMEGA323-8AC
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
ATMEGA3238AC
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Virtual Flash Page Read
Register
Programming algorithm
Entering programming mode
Leaving Programming Mode
1457G–AVR–09/03
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, 1,032 in total. 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 instruction with page
address 0 and ending with the MSB of the instruction with page address 3F. This pro-
vides an efficient way to read one full Flash page to verify programming.
Figure 105. Virtual Flash Page Read Register
All references below of type “1a”, “1b”, and so on, refer to Table 71.
1. Enter JTAG instruction AVR_RESET and shift 1 in the Reset Register.
2. Enter instruction PROG_ENABLE and shift 1010_0011_0111_0000 in the Pro-
1. Enter JTAG instruction PROG_COMMANDS.
2. Disable all programming instructions by using no operation instruction 11a.
3. Enter instruction PROG_ENABLE and shift 0000_0000_0000_0000 in the pro-
4. Enter JTAG instruction AVR_RESET and shift 0 in the Reset Register.
If PROG_ENABLE instruction is not followed by the AVR_RESET instruction, the follow-
ing algorithm should be used:
1. Enter JTAG instruction PROG_COMMANDS.
2. Disable all programming instructions by using no operation instruction 11a.
3. Enter instruction PROG_ENABLE and shift 0000_0000_0000_0000 in the Pro-
4. Enter instruction PROG_ENABLE and shift 0000_0000_0000_0000 in the Pro-
5. Wait until the selected Oscillator has started before applying more commands.
gramming Enable Register.
gramming Enable Register.
gramming Enable Register.
gramming Enable Register.
TDO
TDI
D
A
T
A
machine
State
STROBES
ADDRESS
EEPROM
Lock Bits
Fuses
Flash
ATmega323(L)
209
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