ATMEGA88A-MMH Atmel, ATMEGA88A-MMH Datasheet - Page 304

IC MCU AVR 8K FLASH 28QFN

ATMEGA88A-MMH

Manufacturer Part Number
ATMEGA88A-MMH
Description
IC MCU AVR 8K FLASH 28QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheets

Specifications of ATMEGA88A-MMH

Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
23
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K 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
28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
27.7
27.7.1
27.7.2
8271C–AVR–08/10
Parallel Programming
Enter Programming Mode
Considerations for Efficient Programming
Table 27-16. Command Byte Bit Coding
The following algorithm puts the device in Parallel (High-voltage) Programming mode:
1. Set Prog_enable pins listed in
2. Apply 4.5 - 5.5V between V
Ensure that V
3. Wait 20 - 60 µs, and apply 11.5 - 12.5V to RESET.
4. Keep the Prog_enable pins unchanged for at least 10µs after the High-voltage has been
5. Wait at least 300 µs before giving any parallel programming commands.
6. Exit Programming mode by power the device down or by bringing RESET pin to 0V.
If the rise time of the V
tive algorithm can be used.
1. Set Prog_enable pins listed in
2. Apply 4.5 - 5.5V between V
3. Monitor V
4. Keep the Prog_enable pins unchanged for at least 10µs after the High-voltage has been
5. Wait until V
6. Exit Programming mode by power the device down or by bringing RESET pin to 0V.
The loaded command and address are retained in the device during programming. For efficient
programming, the following should be considered.
• The command needs only be loaded once when writing or reading multiple memory locations.
• Skip writing the data value 0xFF, that is the contents of the entire EEPROM (unless the
• Address high byte needs only be loaded before programming or reading a new 256 word
ATmega48A/48PA/88A/88PA/168A/168PA/328/328
EESAVE Fuse is programmed) and Flash after a Chip Erase.
window in Flash or 256 byte EEPROM. This consideration also applies to Signature bytes
reading.
Command Byte
V
applied to ensure the Prog_enable Signature has been latched.
V
applied to ensure the Prog_enable Signature has been latched.
commands.
CC
CC
0000 1000
0000 0100
0000 0010
0000 0011
to 0V.
to 0V.
CC
CC
CC
, and as soon as V
reaches at least 1.8V within the next 20 µs.
actually reaches 4.5 -5.5V before giving any parallel programming
Command Executed
Read Signature Bytes and Calibration byte
Read Fuse and Lock bits
Read Flash
Read EEPROM
CC
is unable to fulfill the requirements listed above, the following alterna-
CC
CC
Table 27-14 on page 303
and GND.
Table 27-14 on page 303
and GND.
CC
reaches 0.9 - 1.1V, apply 11.5 - 12.5V to RESET.
to “0000”, RESET pin to 0V and
to “0000”, RESET pin to 0V and
304

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