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-rw-r--r--usbdrv/Readme.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/usbdrv/Readme.txt b/usbdrv/Readme.txt
index 0dea48b..cb1a70e 100644
--- a/usbdrv/Readme.txt
+++ b/usbdrv/Readme.txt
@@ -80,6 +80,11 @@ ATTiny26.
See the EasyLogger example at http://www.obdev.at/avrusb/easylogger.html for
code which calibrates the RC oscillator based on the USB frame clock.
+20 MHz Clock
+This module is for people who won't do it with less than the maximum. Since
+20 MHz is not divisible by the USB low speed bit clock of 1.5 MHz, the code
+uses similar tricks as the 16 MHz module to insert leap cycles.
+
USB IDENTIFIERS
===============