ATmega8 Atmel Corporation, ATmega8 Datasheet - Page 219

• Manufacturer Part Number: ATmega8
• Manufacturer: Atmel Corporation

Specifications of ATmega8

• Flash (kbytes): 8 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 23
• Ext Interrupts: 2
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 1
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 3
• Input Capture Channels: 1
• Pwm Channels: 3
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

Parallel
Programming
Parameters, Pin
Mapping, and
Commands
Signal Names
2486Z–AVR–02/11
This section describes how to parallel program and verify Flash Program memory, EEPROM
Data memory, Memory Lock Bits, and Fuse Bits in the ATmega8. Pulses are assumed to be at
least 250ns unless otherwise noted.
In this section, some pins of the ATmega8 are referenced by signal names describing their func-
tionality during parallel programming, see
following table are referenced by pin names.
The XA1/XA0 pins determine the action executed when the XTAL1 pin is given a positive pulse.
The bit coding is shown in
When pulsing WR or OE, the command loaded determines the action executed. The different
Commands are shown in
Figure 104. Parallel Programming
Table 91. Pin Name Mapping
Signal Name in
Programming Mode
RDY/BSY
OE
WR
BS1
XA0
XA1
Table 94 on page
Table 93 on page
Pin Name
RDY/BSY
PAGEL
+12 V
PD1
PD2
PD3
PD4
PD5
PD6
BS1
XA0
XA1
BS2
WR
OE
PD1
PD2
PD3
PD4
PD5
PD6
RESET
XTAL1
GND
PD7
PC2
I/O
O
I
I
I
I
I
Figure 104
220.
220.
PC[1:0]:PB[5:0]
Function
0: Device is busy programming, 1: Device
is ready for new command
Output Enable (Active low)
Write Pulse (Active low)
Byte Select 1 (“0” selects Low byte, “1”
selects High byte)
XTAL Action Bit 0
XTAL Action Bit 1
AVCC
VCC
and
Table
+5V
+5V
DATA
91. Pins not described in the
ATmega8(L)
219