Datasheet

AVR061

2525B–AVR–04/03

Read Fuse Bits Extended Read Extended Fuse bits. The Fuse bit mapping for the currently supported devices is

described in the appendix.

Note: For ISP Programming, use the Cmnd_STK_UNIVERSAL command with the appropriate

ISP command bytes (found in the device data sheet).

Note that some devices combine Lock bits and Fuse bits in way that actually requires

using the Cmnd_STK_READ_LOCK to retrieve the Fuse byte(s). This is described

closer in the appendix.

Command Cmnd_STK_READ_FUSE_EXT

Command Value 0x77

Response Resp_STK_INSYNC, fuse_low, fuse_high, fuse_ext, Resp_STK_OK

Resp_STK_NOSYNC (If no Sync_CRC_EOP received)

Read Lock Bits Read Lock bits. The Lock bit mapping for the currently supported devices is described in

the appendix.

Note: For ISP Programming, use the Cmnd_STK_UNIVERSAL command with the appropriate

ISP command bytes (found in the device data sheet).

Note that some device combine Lock bits and Fuse bits in way that requires some mod-

ification of the read-back fuse before it can be interpreted normally. This is described

closer in the appendix.

Command Cmnd_STK_READ_LOCK, Sync_CRC_EOP

Command Value 0x73

Response Resp_STK_INSYNC, lock, Resp_STK_OK

Resp_STK_NOSYNC (If no Sync_CRC_EOP received)

Table 21. Parameters

Parameter Name Field Usage Field Format

fuse_low Low byte of Fuse bits 1 byte

fuse_high High byte of Fuse bits 1 byte

fuse_ext Extended byte of Fuse bits 1 byte

Table 22. Parameters

Parameter Name Field Usage Field Format

lock Lock bits 1 byte