Datasheet

AVR061

2525B–AVR–04/03

Universal Command Universal command is used to send a generic 32-bit data/command stream directly to

the SPI interface of the current device. Shifting data into the SPI interface at the same

time shifts data out of the SPI interface. The response of the last eight bits that are

shifted out are returned.

Currently this command is used to read and write Fuse and Lock bits in Serial/High-volt-

age mode. For more information, see the appendix.

Command Cmnd_STK_UNIVERSAL, byte1, byte2, byte3, byte4, Sync_CRC_EOP

Command Value 0x56

Response Resp_STK_INSYNC, byte4_out, Resp_STK_OK

Resp_STK_NOSYNC (If no Sync_CRC_EOP received)

Extended Universal

Command

Extended SPI universal command used to clock any number of bytes to the SPI inter-

face of the current device.

Command Cmnd_STK_UNIVERSAL_MULTI, number_of_bytes, data bytes, Sync_CRC_EOP.

Command Value 0x57

Response Resp_STK_INSYNC, Resp_STK_OK

Resp_STK_NOSYNC (if no Sync_CRC_EOP received)

Table 27. Parameters

Parameter Name Field Usage Field Format

byte1 First byte of SPI data/command 1 byte

byte2 Second byte of SPI data/command 1 byte

byte3 Third byte of SPI data/command 1 byte

byte4 Fourth byte of SPI data/command 1 byte

byte4_out The response of the last eight bits to be shifted out from

the SPI interface

1 byte

Table 28. Parameters

Parameter Name Field Usage Field Format

number_of_bytes 0 - 255 equals 1 - 256 bytes to be sent 1 byte