參數(shù)資料
型號: ATTINY13
廠商: Atmel Corp.
元件分類: 8位微控制器
英文描述: -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash
中文描述: 位AVR微控制器具有8K字節(jié)的系統(tǒng)內可編程閃存
文件頁數(shù): 5/176頁
文件大?。?/td> 2962K
代理商: ATTINY13
102
2535J–AVR–08/10
ATtiny13
17. Memory Programming
This section describes how ATtiny13 memories can be programmed.
17.1 Program And Data Memory Lock Bits
ATtiny13 provides two lock bits which can be left unprogrammed (“1”) or can be programmed
(“0”) to obtain the additional security listed in Table 17-2 on page 102. The lock bits can be
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.
Note:
1. “1” means unprogrammed, “0” means programmed
Notes: 1. Program fuse bits before lock bits. See section “Fuse Bytes” on page 103.
2. “1” means unprogrammed, “0” means programmed
Table 17-1.
Lock Bit Byte
Lock Bit Byte
Bit No
Description
Default Value (1)
7
1 (unprogrammed)
6
1 (unprogrammed)
5
1 (unprogrammed)
4
1 (unprogrammed)
3
1 (unprogrammed)
2
1 (unprogrammed)
LB2
1
Lock bit
1 (unprogrammed)
LB1
0
Lock bit
1 (unprogrammed)
Table 17-2.
Lock Bit Protection Modes
Memory Lock Bits (1) (2)
Protection Type
LB Mode
LB2
LB1
1
No memory lock features enabled.
21
0
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.
30
0
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.
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