ATMEGA644P-A15MZ Atmel, ATMEGA644P-A15MZ Datasheet - Page 322

• Manufacturer Part Number: ATMEGA644P-A15MZ
• Description: MCU AVR 64KB FLASH 16MHZ 44QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644P-A15MZ

• Package / Case: 44-VQFN Exposed Pad
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Speed: 16MHz
• Number Of I /o: 32
• Eeprom Size: 2K x 8
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Program Memory Size: 64KB (64K x 8)
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Connectivity: I²C, SPI, UART/USART
• Core Size: 8-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 25-18. JTAG Programming Instruction (Continued)
Notes:
322
Instruction
8e. Read Lock Bits
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...).
ATmega164P/324P/644P
normally the case).
Set (Continued)
o = data out, i = data in, x = don’t care
(9)
a = address high bits, b = address low bits, c = address extended bits, H = 0 - Low byte, 1 - High Byte,
TDI Sequence
0110110_00000000
0110111_00000000
0111010_00000000
0111110_00000000
0110010_00000000
0110110_00000000
0110111_00000000
0100011_00001000
0000011_bbbbbbbb
0110010_00000000
0110011_00000000
0100011_00001000
0000011_bbbbbbbb
0110110_00000000
0110111_00000000
0100011_00000000
0110011_00000000
Table 25-1 on page 296
Table 25-5 on page 298
(Table 25-7
Table 25-4 on page 298
Table 25-3 on page 297
and
Table
25-8) are don’t care
TDO Sequence
xxxxxxx_xxxxxxxx
xxxxxxx_xxoooooo
xxxxxxx_xxxxxxxx
xxxxxxx_oooooooo
xxxxxxx_oooooooo
xxxxxxx_oooooooo
xxxxxxx_oooooooo
xxxxxxx_xxxxxxxx
xxxxxxx_xxxxxxxx
xxxxxxx_xxxxxxxx
xxxxxxx_oooooooo
xxxxxxx_xxxxxxxx
xxxxxxx_xxxxxxxx
xxxxxxx_xxxxxxxx
xxxxxxx_oooooooo
xxxxxxx_xxxxxxxx
xxxxxxx_xxxxxxxx
Notes
(5)
(5)
Fuse Ext. byte
Fuse High byte
Fuse Low byte
Lock bits
7674F–AVR–09/09