ATTINY48-MMH Atmel, ATTINY48-MMH Datasheet - Page 199
![MCU AVR 4KB FLASH 12MHZ 28-VQFN](/photos/12/32/123209/28m1-vqfn_sml.jpg)
ATTINY48-MMH
Manufacturer Part Number
ATTINY48-MMH
Description
MCU AVR 4KB FLASH 12MHZ 28-VQFN
Manufacturer
Atmel
Series
AVR® ATtinyr
Specifications of ATTINY48-MMH
Core Processor
AVR
Core Size
8-Bit
Speed
12MHz
Connectivity
I²C, SPI
Peripherals
Brown-out Detect/Reset, POR, WDT
Number Of I /o
24
Program Memory Size
4KB (2K x 16)
Program Memory Type
FLASH
Eeprom Size
64 x 8
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 6x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
For Use With
ATAVRDRAGON - KIT DRAGON 32KB FLASH MEM AVR
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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21.2.11
21.2.12
8008G–AVR–04/11
Programming the Lock Bits
Reading Fuse and Lock Bits
Figure 21-5. Programming the FUSES Waveforms
The algorithm for programming the lock bits is as follows (see
194
Lock bits can only be cleared by executing Chip Erase.
The algorithm for reading fuse and lock bits is as follows (see
194
Fuse and lock bit mapping is illustrated in
RESET +12V
• A: Load command “0010 0000”
• C: Load data low byte. Bit n = “0” programs the Lock bit. If LB1 and LB2 have been
• Give WR a negative pulse and wait for RDY/BSY to go high
• A: Load command “0000 0100”
• Set OE to “0”, BS2 to “0” and BS1 to “0”. Low fuse bits can now be read at DATA (“0” means
• Set OE to “0”, BS2 to “1” and BS1 to “1”. High fuse bits can now be read at DATA (“0” means
• Set OE to “0”, BS2 to “1”, and BS1 to “0”. Extended fuse bits can now be read at DATA (“0”
• Set OE to “0”, BS2 to “0” and BS1 to “1”. Lock bits can now be read at DATA (“0” means
• Set OE to “1”
RDY/BSY
programmed, it is not possible to program the Lock Bits by any External Programming mode
programmed)
programmed)
means programmed)
programmed)
PAGEL
for details on command and data loading):
for details on command loading):
CLKI
DATA
XA1
XA0
BS1
BS2
WR
OE
0x40
A
DATA
C
Write Fuse Low byte
XX
0x40
A
Figure
DATA
C
21-6, below.
Write Fuse high byte
XX
“Programming the Flash” on page
“Programming the Flash” on page
0x40
A
ATtiny48/88
DATA
C
Write Extended Fuse byte
XX
199
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