ATmega16A datasheet(280/352 Pages) ATMEL

280 / 352 page

280

8154B–AVR–07/09

ATmega16A

Figure 26-8. Serial Programming Instruction example

26.9

SPI Serial Programming Characteristics

For characteristics of the SPI module, see “SPI Timing Characteristics” on page 298.

26.10 Programming via the JTAG Interface

Programming through the JTAG interface requires control of the four JTAG specific pins: TCK,

TMS, TDI and TDO. Control of the reset and clock pins is not required.

To be able to use the JTAG interface, the JTAGEN Fuse must be programmed. The device is

default shipped with the fuse programmed. In addition, the JTD bit in MCUCSR must be cleared.

Alternatively, if the JTD bit is set, the External Reset can be forced low. Then, the JTD bit will be

cleared after two chip clocks, and the JTAG pins are available for programming. This provides a

means of using the JTAG pins as normal port pins in running mode while still allowing In-System

Programming via the JTAG interface. Note that this technique can not be used when using the

JTAG pins for Boundary-scan or On-chip Debug. In these cases the JTAG pins must be dedi-

cated for this purpose.

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

26.10.1

Programming Specific JTAG Instructions

The instruction register is 4-bit wide, supporting up to 16 instructions. The JTAG instructions

useful for Programming are listed below.

Byte 1

Byte 2

Byte 3

Byte 4

Adr LSB

Bit 15 B

Serial Programming Instruction

Program Memory/

EEPROM Memory

Page 0

Page 1

Page 2

Page N-1

Page Buffer

Write Program Memory Page/

Write EEPROM Memory Page

Load Program Memory Page (High/Low Byte)/

Load EEPROM Memory Page (page access)

Byte 1

Byte 2

Byte 3

Byte 4

Bit 15 B

Adr MSB

Page Offset

Page Number

Adr M

Adrr L

LSB

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