Datasheet

1243
32117D–AVR-01/12
AT32UC3C
39.6.8.1 ACK
The AW has received the command successfully and performed the operation.
39.6.8.2 NACK
The AW has received the command, but got a CRC mismatch.
39.6.8.3 IDCODE
The JTAG idcode for this device.
39.6.8.4 MEMDATA
The data read from the address specified by the MEMORY_READ command. The last 3 bytes
are status bytes from the read. The first status byte is the status of the command described in
the table below. The last 2 bytes are the number of remaining data bytes to be sent in the data
field of the packet when the error occurred. If the read was not successful all data bytes after the
failure are undefined. A successful word read (4 bytes) will look like this:
1. 0x55 (sync)
2. 0xC1 (command)
3. 0x00 (length MSB)
4. 0x07 (length LSB)
5. 0xCA (Data MSB)
6. 0xFE
7. 0xBA
8. 0xBE (Data LSB)
9. 0x00 (Status byte)
10. 0x00 (Bytes remaining MSB)
11. 0x00 (Bytes remaining LSB)
12. 0xXX (CRC MSB)
13. 0xXX (CRC LSB)
The status is 0x00 and all data read are valid. An unsuccessful four byte read can look like this:
Table 39-48. ACK Details
Response Details
Response value 0x40
Additional data N/A
Table 39-49. NACK Details
Response Details
Response value 0x41
Additional data N/A
Table 39-50. IDCODE Details
Response Details
Response value 0xC0
Additional data JTAG idcode