ATTINY13-20PJ Atmel, ATTINY13-20PJ Datasheet - Page 102

• Manufacturer Part Number: ATTINY13-20PJ
• Description: IC MCU AVR 1K 5V 20MHZ 8DIP
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY13-20PJ

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 6
• Program Memory Size: 1KB (512 x 16)
• Program Memory Type: FLASH
• Eeprom Size: 64 x 8
• Ram Size: 64 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Connectivity: -
• Other names: ATTINY13-24PJ; ATTINY13-24PJ

17. Memory Programming
17.1
102
Program And Data Memory Lock Bits
ATtiny13
This section describes how ATtiny13 memories can be programmed.
ATtiny13 provides two lock bits which can be left unprogrammed (“1”) or can be programmed
(“0”) to obtain the additional security listed in
erased to “1” with the Chip Erase command, only.
Program memory can be read out via the debugWIRE interface when the DWEN fuse is pro-
grammed, even if the lock bits are set. Thus, when lock bit security is required, debugWIRE
should always be disabled by clearing the DWEN fuse.
Table 17-1.
Note:
Table 17-2.
Notes:
LB2
LB1
LB Mode
Lock Bit Byte
Memory Lock Bits
1
2
3
1. “1” means unprogrammed, “0” means programmed
1. Program fuse bits before lock bits. See section
2. “1” means unprogrammed, “0” means programmed
Lock Bit Byte
Lock Bit Protection Modes
LB2
1
1
0
(1) (2)
LB1
1
0
0
Bit No
7
6
5
4
3
2
1
0
Protection Type
No memory lock features enabled.
Further programming of the Flash and EEPROM is disabled in
High-voltage and Serial Programming mode. Fuse bits are
locked in both Serial and High-voltage Programming mode.
debugWire is disabled.
Further programming and verification of the Flash and
EEPROM is disabled in High-voltage and Serial Programming
mode. Fuse bits are locked in both Serial and High-voltage
Programming mode. debugWire is disabled.
Description
–
–
–
–
–
–
Lock bit
Lock bit
Table 17-2 on page
“Fuse Bytes” on page
Default Value
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
102. The lock bits can be
103.
(1)
2535J–AVR–08/10