ATtiny28L Atmel Corporation, ATtiny28L Datasheet - Page 47

• Manufacturer Part Number: ATtiny28L
• Manufacturer: Atmel Corporation

Specifications of ATtiny28L

• Flash (kbytes): 2 Kbytes
• Pin Count: 28
• Max. Operating Frequency: 4 MHz
• Cpu: 8-bit AVR
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 11
• Ext Interrupts: 10
• Usb Speed: No
• Usb Interface: No
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 0.03
• Self Program Memory: NO
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 1
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

Programming the Flash
Parallel Programming
Signal Names
1062F–AVR–07/06
Atmel’s ATtiny28 offers 2K bytes of Flash program memory.
The ATtiny28 is shipped with the on-chip Flash program memory array in the erased
state (i.e., contents = $FF) and ready to be programmed. This device supports a high-
voltage (12V) parallel programming mode. Only minor currents (<1mA) are drawn from
the +12V pin during programming.
The program memory array in the ATtiny28 is programmed byte-by-byte. During pro-
gramming, the supply voltage must be in accordance with Table 21.
Table 21. Supply Voltage during Programming
This section describes how to parallel program and verify Flash program memory, Lock
bits and Fuse bits in the ATtiny28.
In this section, some pins of the ATtiny28 are referenced by signal names describing
their function during parallel programming. See Figure 37 and Table 22. Pins not
described in Table 22 are referenced by pin name.
The XA1/XA0 pins determine the action executed when the XTAL1 pin is given a posi-
tive pulse. The coding is shown in Table 23.
When pulsing WR or OE, the command loaded determines the action executed. The
command is a byte where the different bits are assigned functions, as shown in Table
24.
Figure 37. Parallel Programming
Part
ATtiny28
RDY/BSY
Serial Programming
Not applicable
+12V
XA0
XA1
WR
OE
BS
PD1
PD2
PD3
PD4
PD5
PD6
RESET
XTAL1
GND
ATtiny28
PB7 - PB0
VCC
Parallel Programming
4.5 - 5.5V
+5V
ATtiny28L/V
DATA
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