ATSC018-SU-CM ATMEL [ATMEL Corporation], ATSC018-SU-CM Datasheet - Page 10

• Manufacturer Part Number: ATSC018-SU-CM
• Description: AT90USB1287 (AVR) 64 QFN device (2.7V < VCC < 5.5V)
• Manufacturer: ATMEL [ATMEL Corporation]

AT88SCK109STK3
3.4
3.5
3.5.1
3.5.2
3.5.3
3-8
8699A—CRYPTO—10/09
AT90USB1287 AVR Microcontroller
Serial Links
USB
USART
SPI / TWI Selector Switch
To use the USB interface of the AT90USB1287, the clock source should always be a crystal or an
external clock oscillator (the internal 8MHz RC oscillator cannot be used to operate the USB
interface). Only the following crystal frequencies allow proper USB operations: 2MHz, 4MHz,
6MHz, 8MHz, 12MHz, and 16MHz. The AT88Microbase comes with a default 16MHz crystal
oscillator,
CryptoAuthentication communication.
The AT88Microbase is supplied with a standard USB Type-A receptacle. The AT88Microbase only
operates as an “USB device”.
Figure 6.
The AT90USB1287 AVR comes with an on-chip USART peripheral (USART1).
asynchronous mode is supported. See section 3.6.3 for pinout details.
The SPI – TWI selector switch (K1) allows either the SPI pins (MOSI and SCLK) or the TWI pins
(SDA and SCL) to be routed to the 10 pin Interface header, J1. See section 3.6.3 for pinout details.
Figure 7.
USB Type-A Receptacle
TWI – SPI Selector Switch
which
is
required
to
obtain
the
230.4K
USART
baud
AT88CK109STK3 User Guide
rate
needed
Only the
for