ATtiny5 datasheet(97/168 Pages) ATMEL

97 / 168 page

8127C–AVR–10/09

ATtiny4/5/9/10

The TPI is accessed via three pins, as follows:

RESET:

Tiny Programming Interface enable input

TPICLK:

Tiny Programming Interface clock input

TPIDATA:

Tiny Programming Interface data input/output

In addition, the VCC and GND pins must be connected between the external programmer and the

device. See Figure 14-2.

Figure 14-2. Using an External Programmer for In-System Programming via TPI

NVM can be programmed at 5V, only. In some designs it may be necessary to protect compo-

nents that can not tolerate 5V with, for example, series resistors.

14.3.1

Enabling

The following sequence enables the Tiny Programming Interface (see Figure 14-3 for guidance):

• Apply 5V between VCC and GND

• Depending on the method of reset to be used:

– Either: wait tTOUT (see Table 16-4 on page 119) and then set the RESET pin low.

This will reset the device and enable the TPI physical layer. The RESET pin must

then be kept low for the entire programming session

– Or: if the RSTDISBL configuration bit has been programmed, apply 12V to the

RESET pin. The RESET pin must be kept at 12V for the entire programming session

•Wait tRST (see Table 16-4 on page 119)

• Keep the TPIDATA pin high for 16 TPICLK cycles

Figure 14-3. Sequence for enabling the Tiny Programming Interface

ATtiny4/5/9/10

TPIDATA/PB0

GND

TPICLK/PB1

PB3/RESET

VCC

PB2

TPI

CONN

APPLICATION

+5V

RESET

RST

TPIDATA

TPICLK

16 x TPICLK CYCLES

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