AT90SCR100 datasheet(385/433 Pages) ATMEL

385 / 433 page

385

TPR0327AY–SMS–30Jan09

AT90SCR100

Figure 29-2.

Serial Programming Instruction example

29.7.1

Serial Programming Characteristics

For characteristics of the Serial Programming module. See “SPI Timing Characteristics

TBC/TBD” on page 413.

Figure 29-3.

Serial Programming Waveforms

29.8

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

Byte 1

Byte 2

Byte 3

Byte 4

Adr MSB

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

Adr LSB

Page Offset

Page Number

Adr M

MSB

Adrr LS

MSB

LSB

SERIAL CLOCK INPUT

(SCK)

SERIAL DA TA INPUT

(MOSI)

(MISO)

SAMPLE

SERIAL DA TA OUTPUT

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