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102

8127B–AVR–08/09

ATtiny4/5/9/10

14.5 Instruction Set

The TPI has a compact instruction set that is used to access the TPI Control and Status Space

(CSS) and the data space. The instructions allow the external programmer to access the TPI,

the NVM Controller and the NVM memories. All instructions except SKEY require one byte oper-

and following the instruction. The SKEY instruction is followed by 8 data bytes. All instructions

are byte-sized.

The TPI instruction set is summarised in Table 14-1.

14.5.1 SLD - Serial LoaD from data space using indirect addressing

The SLD instruction uses indirect addressing to load data from the data space to the TPI physi-

cal layer shift-register for serial read-out. The data space location is pointed by the Pointer

Table 14-1. Instruction Set Summary

Mnemonic Operand Description Operation

SLD data, PR

Serial LoaD from data space using indirect

addressing

data ← DS[PR]

SLD data, PR+

Serial LoaD from data space using indirect

addressing and post-increment

data ← DS[PR]

PR ← PR+1

SST PR, data

Serial STore to data space using indirect

addressing

DS[PR]

← data

SST PR+, data

Serial STore to data space using indirect

addressing and post-increment

DS[PR] ← data

PR ← PR+1

SSTPR PR, a

Serial STore to Pointer Register using direct

addressing

PR[a] ← data

SIN data, a Serial IN from data space data ← I/O[a]

SOUT a, data Serial OUT to data space I/O[a]

← data

SLDCS data, a

Serial LoaD from Control and Status space

using direct addressing

data ← CSS[a]

SSTCS a, data

Serial STore to Control and Status space

using direct addressing

CSS[a]

← data

SKEY Key, {8{data}} Serial KEY Key ← {8{data}}

Table 14-2. The Serial Load from Data Space (SLD) Instruction

Operation Opcode Remarks Register

data ← DS[PR]

0010 0000

PR ← PR

Unchanged

data

← DS[PR]

0010 0100

PR ← PR + 1

Post increment

1 2 ... 97 98 99 100 101 102 103 104 105 106 107 ... 165 166

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