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Boundary-scan chain, Boundary-scan specific jtag instructions, Extest; 0x0 – Rainbow Electronics ATmega162V User Manual

Page 205: Atmega162/v

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205

ATmega162/V

2513E–AVR–09/03

on the Fuse settings for the clock options, the part will remain reset for a Reset Time-out
Period (refer to “Clock Sources” on page 34) after releasing the Reset Register. The
output from this data register is not latched, so the reset will take place immediately, as
shown in Figure 86.

Figure 86. Reset Register

Boundary-scan Chain

The Boundary-scan Chain has the capability of driving and observing the logic levels on
the digital I/O pins, as well as the boundary between digital and analog logic for analog
circuitry having Off-chip connections.

See “Boundary-scan Chain” on page 207 for a complete description.

Boundary-scan Specific
JTAG Instructions

The Instruction Register is 4-bit wide, supporting up to 16 instructions. Listed below are
the JTAG instructions useful for Boundary-scan operation. Note that the optional HIGHZ
instruction is not implemented, but all outputs with tri-state capability can be set in high-
impedant state by using the AVR_RESET instruction, since the initial state for all port
pins is tri-state.

As a definition in this datasheet, the LSB is shifted in and out first for all Shift Registers.

The OPCODE for each instruction is shown behind the instruction name in hex format.
The text describes which Data Register is selected as path between TDI and TDO for
each instruction.

EXTEST; 0x0

Mandatory JTAG instruction for selecting the Boundary-scan Chain as Data Register for
testing circuitry external to the AVR package. For port-pins, Pull-up Disable, Output
Control, Output Data, and Input Data are all accessible in the scan chain. For analog cir-
cuits having Off-chip connections, the interface between the analog and the digital logic
is in the scan chain. The contents of the latched outputs of the Boundary-scan chain is
driven out as soon as the JTAG IR-Register is loaded with the EXTEST instruction.

The active states are:

Capture-DR: Data on the external pins are sampled into the Boundary-scan Chain.

Shift-DR: The Internal Scan Chain is shifted by the TCK input.

Update-DR: Data from the scan chain is applied to output pins.

D

Q

From

TDI

ClockDR · AVR_RESET

To

TDO

From Other Internal and

External Reset Sources

Internal Reset