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ATmega128
Reset Register
Programming Enable
Register
The Reset Register is a Test Data Register used to reset the part during programming. It is
required to reset the part before entering programming mode.
A high value in the Reset Register corresponds to pulling the external Reset low. The part is
reset as long as there is a high value present in the Reset Register. Depending on the Fuse set-
tings for the clock options, the part will remain reset for a Reset Time-Out Period (refer to “Clock
Sources” on page 36 ) 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 123 on page 254 .
The Programming Enable Register is a 16-bit register. The contents of this register is compared
to the programming enable signature, binary code 1010_0011_0111_0000. W hen the contents
of the register is equal to the programming enable signature, programming via the JTAG port is
enabled. The Register is reset to 0 on Power-on Reset, and should always be reset when leav-
ing Programming mode.
Figure 147. Programming Enable Register
TDI
D
A
T
$A370
=
D
Q
Programming enable
A
ClockDR & PROG_ENABLE
TDO
308
2467X–AVR–06/11
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