ATtiny5 datasheet(96/168 Pages) ATMEL

96 / 168 page

8127C–AVR–10/09

ATtiny4/5/9/10

14. Programming interface

14.1 Features

• Physical Layer:

– Synchronous Data Transfer

– Bi-directional, Half-duplex Receiver And Transmitter

– Fixed Frame Format With One Start Bit, 8 Data Bits, One Parity Bit And 2 Stop Bits

– Parity Error Detection, Frame Error Detection And Break Character Detection

– Parity Generation And Collision Detection

– Automatic Guard Time Insertion Between Data Reception And Transmission

• Access Layer:

– Communication Based On Messages

– Automatic Exception Handling Mechanism

– Compact Instruction Set

– NVM Programming Access Control

– Tiny Programming Interface Control And Status Space Access Control

– Data Space Access Control

14.2 Overview

The Tiny Programming Interface (TPI) supports external programming of all Non-Volatile Memo-

ries (NVM). Memory programming is done via the NVM Controller, by executing NVM controller

commands as described in “Memory Programming” on page 107.

The Tiny Programming Interface (TPI) provides access to the programming facilities. The inter-

face consists of two layers: the access layer and the physical layer. The layers are illustrated in

Figure 14-1.

Figure 14-1. The Tiny Programming Interface and Related Internal Interfaces

Programming is done via the physical interface. This is a 3-pin interface, which uses the RESET

pin as enable, the TPICLK pin as the clock input, and the TPIDATA pin as data input and output.

NVM can be programmed at 5V, only.

14.3 Physical Layer of Tiny Programming Interface

The TPI physical layer handles the basic low-level serial communication. The TPI physical layer

uses a bi-directional, half-duplex serial receiver and transmitter. The physical layer includes

serial-to-parallel and parallel-to-serial data conversion, start-of-frame detection, frame error

detection, parity error detection, parity generation and collision detection.

ACCESS

LAYER

PHYSICAL

LAYER

NVM

CONTROLLER

NON-VOLATILE

MEMORIES

TPICLK

RESET

TPIDATA

TINY PROGRAMMING INTERFACE (TPI)

DATA BUS

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