Rainbow-electronics ATtiny10 Bedienungsanleitung PDF herunterladen (Seite 108)

108

8127B–AVR–08/09

ATtiny4/5/9/10

15.3 Non-Volatile Memories

The ATtiny4/5/9/10 have the following, embedded NVM:

• Non-Volatile Memory Lock Bits

• Flash memory with four separate sections

15.3.1 Non-Volatile Memory Lock Bits

The ATtiny4/5/9/10 provide two Lock Bits, as shown in Table 15-1.

The Lock Bits can be left unprogrammed ("1") or can be programmed ("0") to obtain the addi-

tional security shown in Table 15-2. Lock Bits can be erased to "1" with the Chip Erase

command, only.

Notes: 1. Program the configuration section bits before programming NVLB1 and NVLB2.

2. "1" means unprogrammed, "0" means programmed

Table 15-1. Lock Bit Byte

Lock Bit Bit No Description Default Value

7 1 (unprogrammed)

6 1 (unprogrammed)

5 1 (unprogrammed)

4 1 (unprogrammed)

3 1 (unprogrammed)

2 1 (unprogrammed)

NVLB2 1 Non-Volatile Lock Bit 1 (unprogrammed)

NVLB1 0 Non-Volatile Lock Bit 1 (unprogrammed)

Table 15-2. Lock Bit Protection Modes

Memory Lock Bits

(1)

Protection TypeLock Mode NVLB2

(2)

NVLB1

(2)

1 1 1 No Memory Lock feature Enabled

210

Further Programming of the Flash memory is disabled in

the external programming mode. The configuration

section bits are locked in the external programming

mode

300

Further programming and verification of the flash is

disabled in the external programming mode. The

configuration section bits are locked in the external

programming mode

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