ATtiny28L Atmel Corporation, ATtiny28L Datasheet - Page 48

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ATtiny28L

Manufacturer Part Number
ATtiny28L
Description
Manufacturer
Atmel Corporation
Datasheets

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
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Enter Programming Mode
48
ATtiny28L/V
Table 22. Pin Name Mapping
.
Table 23. XA1 and XA0 Coding
Table 24. Command Byte Coding
The following algorithm puts the device in parallel programming mode:
1. Apply 4.5 - 5.5V between VCC and GND.
2. Set RESET and BS pins to “0” and wait at least 100 ns.
3. Apply 11.5 - 12.5V to RESET. Any activity on BS within 100 ns after +12V has
XA1
Programming Mode
0
0
1
1
been applied to RESET will cause the device to fail entering programming mode.
Signal Name in
Command Byte
RDY/BSY
XA0
1000 0000
0100 0000
0010 0000
0001 0000
0000 1000
0000 0100
0000 0010
0
1
0
1
DATA
XA0
XA1
WR
OE
BS
Action when XTAL1 is Pulsed
Load Flash/Signature byte Address (High or low address byte for Flash
determined by BS)
Load Data (High or low data byte for Flash determined by BS)
Load Command
No Action, Idle
PB7 - PB0
Pin Name
PD1
PD2
PD3
PD4
PD5
PD6
Command Executed
Chip Erase
Write Fuse Bits
Write Lock Bits
Write Flash
Read Signature Bytes and Calibration Byte
Read Fuse and Lock Bits
Read Flash
I/O
I/O
O
I
I
I
I
I
Function
“0”: Device is busy programming, “1”: Device is
ready for new command
Output Enable (active low)
Write Pulse (active low)
Byte Select (“0” selects low byte, “1” selects
high byte)
XTAL1 Action Bit 0
XTAL1 Action Bit 1
Bi-directional Data Bus (output when OE is low)
1062F–AVR–07/06

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