ATMEGA8A-MUR Atmel, ATMEGA8A-MUR Datasheet - Page 239

• Manufacturer Part Number: ATMEGA8A-MUR
• Description: MCU AVR 8KB FLASH 16MHZ 32QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA8A-MUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• 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): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

24.8
24.9
8159D–AVR–02/11
Serial Downloading
Serial Programming Pin Mapping
Table 24-13. Parallel Programming Characteristics, V
Notes:
Both the Flash and EEPROM memory arrays can be programmed using the serial SPI bus while
RESET is pulled to GND. The serial interface consists of pins SCK, MOSI (input) and MISO (out-
put). After RESET is set low, the Programming Enable instruction needs to be executed first
before program/erase operations can be executed. NOTE, in
mapping for SPI programming is listed. Not all parts use the SPI pins dedicated for the internal
SPI interface.
Table 24-14. Pin Mapping Serial Programming
Figure 24-7. Serial Programming and Verify
Notes:
When programming the EEPROM, an auto-erase cycle is built into the self-timed programming
operation (in the Serial mode ONLY) and there is no need to first execute the Chip Erase
instruction. The Chip Erase operation turns the content of every memory location in both the
Program and EEPROM arrays into 0xFF.
Symbol
t
t
t
BVDV
OLDV
OHDZ
1. t
2. t
1. If the device is clocked by the Internal Oscillator, it is no need to connect a clock source to the
2. V
Symbol
MOSI
MISO
SCK
commands.
XTAL1 pin.
WLRH
WLRH_CE
CC
Parameter
BS1 Valid to DATA valid
OE Low to DATA Valid
OE High to DATA Tri-stated
- 0.3 <
is valid for the Write Flash, Write EEPROM, Write Fuse Bits and Write Lock Bits
is valid for the Chip Erase command.
AV
CC
< V
CC
MOSI
MISO
Pins
PB3
PB4
PB5
SCK
+ 0.3, however,
PB3
PB4
PB5
XTAL1
RESET
GND
(1)
AV
I/O
O
I
I
CC
AVCC
VCC
should always be within 2.7 - 5.5V.
CC
+2.7 - 5.5V
+2.7 - 5.5V
= 5V ± 10% (Continued)
Description
Serial data in
Serial data out
Serial clock
Table 24-14 on page
(2)
Min
0
Typ
ATmega8A
Max
250
250
250
239, the pin
Units
ns
ns
ns
239