SL11RIDE
Document #: 38-08007 Rev. **
Page 7 of 27
Figure 4-3. 12-MHz Crystal Circuits
Note: You need to set bit C2 =1 from configuration address (0xC006). See section 10.8 for CPU speed control.
4.7
Serial I2C Interface
The SL11RIDE provides an interface to an external serial flash EEPROM. A variety of serial EEPROM formats can be supported.
Currently the SL11RIDE firmware supports the two-wire serial flash EEPROM type. It can be used for field product upgrades if
needed.
The recommended serial EEPROM device is a two-wire Serial CMOS EEPROM (AT24LCXX Device Family). Currently, the
SL11RIDE allows writing to EEPROM, up to 2 KBytes, using a 16-Kbit I2C device (i.e. AT24LC16B/SN).
The USB vendor/device configuration can be programmed and stored into the external EEPROM device. On power-up, the
contents of the EEPROM will be downloaded into RAM. The advantage of the EEPROM interface is both cost and space saving
compared with using an external 8-bit PROM/EPROM.
Figure 4-4. I2C 2-Kbyte Connection
Note: You can choose either a 3.3V or a 5.0V EEPROM.
5.0
Software
The SL11RIDE software is USB Specification and USB Mass Storage Class Bulk-Only Transport version 1.0 compliant in the
final release. In the meantime, it will try to track changes to the USB Mass Storage Class Bulk-Only Transport as closely as
possible. The interface to the host PC is USB, which allows true Plug-and-Play (PnP). The requirement for Operating System
(OS) on the host PC side is Win98/2000 or MAC.
Rf
1M
Rs
100
Cin
22 pF
X1
12 MHz , series, 20-pF load
Cout
22 pF
X1
X2
SCL
EEPROM
AT24C16
1
2
3
4
8
7
6
5
A0
A1
A2
GND
VCC
WP
SCL
SDA
SDA
0.1
µF
VCC
1.5-5K
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