ATmega8 Atmel Corporation, ATmega8 Datasheet - Page 219
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ATmega8
Manufacturer Part Number
ATmega8
Description
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
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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