ATMEGA323-8AI Atmel, ATMEGA323-8AI Datasheet - Page 160
![IC AVR MCU 32K 8MHZ IND 44TQFP](/photos/6/70/67042/313-44-tqfp_sml.jpg)
ATMEGA323-8AI
Manufacturer Part Number
ATMEGA323-8AI
Description
IC AVR MCU 32K 8MHZ IND 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA323L-4PC.pdf
(247 pages)
Specifications of ATMEGA323-8AI
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
-40°C ~ 85°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
ATMEGA3238AI
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TAP Controller
160
ATmega323(L)
Figure 86. TAP Controller State Diagram
The TAP controller is a 16-state finite state machine that controls the operation of the
Boundary-Scan circuitry, JTAG programming circuitry, or On-chip Debug system. The
state transitions depicted in Figure 86 depends on the signal present on TMS (shown
adjacent to each state transition) at the time of the rising edge at TCK. The initial state
after a Power-On Reset is Test-Logic-Reset.
As a definition in this document, the LSB is shifted in and out first for all Shift Registers.
Assuming Run-Test/Idle is the present state, a typical scenario for using the JTAG inter-
face is
•
1
0
At the TMS input, apply the sequence 1, 1, 0, 0 at the rising edges of TCK to enter
the Shift Instruction Register – Shift-IR state. While TMS is low, shift the 4-bit JTAG
instructions into the JTAG Instruction Register from the TDI input at the rising edge
of TCK, while the captured IR-state 0x01 is shifts out on the TDO pin. The JTAG
Instruction selects a particular Data Register as path between TDI and TDO and
controls the circuitry surrounding the selected Data Register.
Test-Logic-Reset
Run-Test/Idle
0
1
1
0
Select-DR Scan
Capture-DR
Update-DR
Pause-DR
Exit1-DR
Exit2-DR
Shift-DR
1
0
0
1
0
1
1
0
1
1
0
0
1
0
Select-IR Scan
Capture-IR
Update-IR
Pause-IR
Exit1-IR
Exit2-IR
Shift-IR
1
0
0
1
0
1
1
1457G–AVR–09/03
0
1
1
0
0
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