ATtiny5 datasheet(106/168 Pages) ATMEL

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106

8127C–AVR–10/09

ATtiny4/5/9/10

• Bits 2:0 – GT[2:0]: Guard Time

These bits specify the number of additional IDLE bits that are inserted to the idle time when

changing from reception mode to transmission mode. Additional delays are not inserted when

changing from transmission mode to reception.

The total idle time when changing from reception to transmission mode is Guard Time plus two

IDLE bits. Table 14-13 shows the available Guard Time settings.

The default Guard Time is 128 IDLE bits. To speed up the communication, the Guard Time

should be set to the shortest safe value.

14.7.3

TPISR – Tiny Programming Interface Status Register

• Bits 7:2, 0 – Res: Reserved Bits

These bits are reserved and will always read zero.

• Bit 1 – NVMEN: Non-Volatile Memory Programming Enabled

NVM programming is enabled when this bit is set. The external programmer can poll this bit to

verify the interface has been successfully enabled.

NVM programming is disabled by writing this bit to zero.

Table 14-13. Guard Time Settings

GT2

GT1

GT0

Guard Time (Number of IDLE bits)

+128 (default value)

001

+64

010

+32

011

+16

100

101

110

111

Bit

765

4321

CSS: 0x00

–

–NVMEN

–TPIPCR

Read/Write

RRRR

R/W

Initial Value

000

0000

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