Rainbow-electronics ATmega128L User Manual download pdf (Page 300)

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101

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ATmega128(L)

2467B–09/01

When the contents of the register is equal to the programming enable signature, pro-

gramming via the JTAG port is enabled. The register is reset to 0 on power-on reset,

and should always be reset when leaving programming mode.

Figure 147. Programming Enable Register

Programming Command

The Programming Command register is a 15-bit register. This register is used to serially

shift in programming commands, and to serially shift out the result of the previous com-

mand, if any. The JTAG Programming Instruction Set is shown in

Table 132. The state

sequence when shifting in the programming commands is illustrated in

Figure 149.

TDI

TDO

ClockDR & PROG_ENABLE

Programming enable

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