ATtiny5 datasheet(104/168 Pages) ATMEL

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8127C–AVR–10/09

ATtiny4/5/9/10

14.5.6

SLDCS - Serial LoaD data from Control and Status space using direct addressing

The SLDCS instruction loads data byte from the TPI Control and Status Space to the TPI physi-

cal layer shift register for serial read-out. The SLDCS instruction uses direct addressing, the

direct address consisting of the 4 address bits of the instruction, as shown in Table 14-7.

14.5.7

SSTCS - Serial STore data to Control and Status space using direct addressing

The SSTCS instruction stores the data byte that is shifted into the TPI physical layer shift regis-

ter to the TPI Control and Status Space. The SSTCS instruction uses direct addressing, the

direct address consisting of the 4 address bits of the instruction, as shown in Table 14-8.

14.5.8

SKEY - Serial KEY signaling

The SKEY instruction is used to signal the activation key that enables NVM programming. The

SKEY instruction is followed by the 8 data bytes that includes the activation key, as shown in

Table 14-9.

14.6 Accessing the Non-Volatile Memory Controller

By default, NVM programming is not enabled. In order to access the NVM Controller and be able

to program the non-volatile memories, a unique key must be sent using the SKEY instruction.

The 64-bit key that will enable NVM programming is given in Table 14-10.

After the key has been given, the Non-Volatile Memory Enable (NVMEN) bit in the TPI Status

NVM programming is disabled by writing a logical zero to the NVMEN bit in TPISR.

Table 14-7.

The Serial Load Data from Control and Status space (SLDCS) Instruction

Operation

Opcode

Remarks

data

← CSS[a]

1000 aaaa

Bits marked ‘a’ form the direct, 4-bit addres

Table 14-8.

The Serial STore data to Control and Status space (SSTCS) Instruction

Operation

Opcode

Remarks

CSS[a]

← data

1100 aaaa

Bits marked ‘a’ form the direct, 4-bit addres

Table 14-9.

The Serial KEY signaling (SKEY) Instruction

Operation

Opcode

Remarks

Key

← {8[data}}

1110 0000

Data bytes follow after instruction

Table 14-10. Enable Key for Non-Volatile Memory Programming

Key

Value

NVM Program Enable

0x1289AB45CDD888FF

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