ATtiny5 datasheet(115/168 Pages) ATMEL

115 / 168 page

115

8127C–AVR–10/09

ATtiny4/5/9/10

15.7 Register Description

15.7.1

NVMCSR - Non-Volatile Memory Control and Status Register

• Bit 7 - NVMBSY: Non-Volatile Memory Busy

This bit indicates the NVM memory (Flash memory and Lock Bits) is busy, being programmed.

This bit is set when a program operation is started, and it remains set until the operation has

been completed.

• Bit 6:0 - Res: Reserved Bits

These bits are reserved and will always be read as zero.

15.7.2

NVMCMD - Non-Volatile Memory Command Register

• Bit 7:6 - Res: Reserved Bits

These bits are reserved and will always read zero.

• Bit 5:0 - NVMCMD[5:0]: Non-Volatile Memory Command

These bits define the programming commands for the flash, as shown in Table 15-10.

Bit

6543210

0x32

NVMBSY

–

–NVMCSR

Read/Write

R/W

RRRRRR

Initial Value

0000000

Bit

76543210

0x33

–

NVMCMD[5:0]

NVMCMD

Read/Write

R/W

Initial Value

00000000

Table 15-10. NVM Programming commands

Operation Type

NVMCMD

Mnemonic

Description

Binary

Hex

General

0b000000

0x00

NO_OPERATION

No operation

0b010000

0x10

CHIP_ERASE

Chip erase

Section

0b010100

0x14

SECTION_ERASE

Section erase

Word

0b011101

0x1D

WORD_WRITE

Word write

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