430
8331B–AVR–03/12
Atmel AVR XMEGA AU
• Bit 2:0 – GUARDTIME[2:0]: Guard Time
These bits specify the number of IDLE bits of guard time that are inserted in between PDI recep-
tion and transmission direction changes. The default guard time is 128 IDLE bits, and the
available settings are shown in Table 32-1 on page 430. In order to speed up the communica-
tion, the guard time should be set to the lowest safe configuration accepted. No guard time is
inserted when switching from TX to RX mode.
32.8 Register Summary
Table 32-1. Guard time settings.
GUARDTIME Number of IDLE Bits
000 128
001 64
010 32
011 16
100 8
101 4
110 2
111 2
Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Page
+0x00 STATUS – – – – – – NVMEN –429
+0x01 RESET RESET[7:0] 429
+0x02 CTRL – – – – –GUARDTIME[2:0]429
+0x03 Reserved – – – – – – – –
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