Rainbow-electronics ATmega32L Manuel d'utilisateur télécharger pdf (Page 275)

100

101

275

ATmega32(L)

2503C–AVR–10/02

Programming Enable Register 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.

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 139. Programming Enable Register

Programming Command

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

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

command, if any. The JTAG Programming Instruction Set is shown in Table 117. The

state sequence when shifting in the programming commands is illustrated in Figure 141.

Figure 140. Programming Command Register

TDI

TDO

ClockDR & PROG_ENABLE

Programming Enable

$A370

TDI

TDO

Flash

EEPROM

Fuses

Lock Bits

1 2 ... 270 271 272 273 274 275 276 277 278 279 280 ... 312 313

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Rainbow-electronics ATmega32L Manuel d'utilisateur Page 275

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