Atmel ATSTK500 500 Starter kit and development system. ATSTK500 ATSTK500 Hoja De Datos

2525B–AVR–04/03

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.

Cmnd_STK_READ_FUSE_EXT

0x77

Resp_STK_INSYNC, fuse_low, fuse_high, fuse_ext, Resp_STK_OK 

or

Resp_STK_NOSYNC (If no Sync_CRC_EOP received)

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.

Cmnd_STK_READ_LOCK, Sync_CRC_EOP

0x73

Resp_STK_INSYNC, lock, Resp_STK_OK 

or

Resp_STK_NOSYNC (If no Sync_CRC_EOP received)

Table 21.  Parameters

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

lock

Lock bits

1 byte