ATMEGA325A-MU Atmel, ATMEGA325A-MU Datasheet - Page 311

• Manufacturer Part Number: ATMEGA325A-MU
• Description: IC MCU AVR 32K FLASH 64VQFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA325A-MU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 54
• 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): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-VFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 26-17. JTAG Programming Instruction (Continued)
Notes:
8285B–AVR–03/11
Instruction
8f. Read Fuses and Lock Bits
9a. Enter Signature Byte Read
9b. Load Address Byte
9c. Read Signature Byte
10a. Enter Calibration Byte Read
10b. Load Address Byte
10c. Read Calibration Byte
11a. Load No Operation Command
1. This command sequence is not required if the seven MSB are correctly set by the previous command sequence (which is
2. Repeat until o = “1”.
3. Set bits to “0” to program the corresponding Fuse, “1” to unprogram the Fuse.
4. Set bits to “0” to program the corresponding Lock bit, “1” to leave the Lock bit unchanged.
5. “0” = programmed, “1” = unprogrammed.
6. The bit mapping for Fuses Extended byte is listed in
7. The bit mapping for Fuses High byte is listed in
8. The bit mapping for Fuses Low byte is listed in
9. The bit mapping for Lock bits byte is listed in
10. Address bits exceeding PCMSB and EEAMSB
11. All TDI and TDO sequences are represented by binary digits (0b...).
normally the case).
Set (Continued)
ATmega165A/165PA/325A/325PA/3250A/3250PA/6
a = address high bits, b = address low bits, H = 0 - Low byte, 1 - High Byte, o = data out, i = data in, x
TDI Sequence
0111010_00000000
0111110_00000000
0110010_00000000
0110110_00000000
0110111_00000000
0000011_bbbbbbbb
0110010_00000000
0110011_00000000
0000011_bbbbbbbb
0110110_00000000
0110111_00000000
0100011_00000000
0110011_00000000
0100011_00001000
0100011_00001000
Table 26-1 on page 283
Table 26-5 on page 285
(Table 26-7
Table 26-4 on page 285
Table 26-3 on page 284
and
Table
26-8) are don’t care
TDO Sequence
xxxxxxx_xxxxxxxx
xxxxxxx_oooooooo
xxxxxxx_oooooooo
xxxxxxx_oooooooo
xxxxxxx_oooooooo
xxxxxxx_xxxxxxxx
xxxxxxx_xxxxxxxx
xxxxxxx_oooooooo
xxxxxxx_xxxxxxxx
xxxxxxx_xxxxxxxx
xxxxxxx_oooooooo
xxxxxxx_xxxxxxxx
xxxxxxx_xxxxxxxx
xxxxxxx_xxxxxxxx
xxxxxxx_xxxxxxxx
Notes
(5)
Fuse Ext. byte
Fuse High byte
Fuse Low byte
Lock bits
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