MEDIATEK LinkIt Smart 7688 Developer's Manual page 23

Next, you will move a resistor by unsoldering and soldering it to a lower position as shown
2)
in Figure 9, after you're finished moving the resistor, restart the device and you should be
able to access JTAG mode.
2.3.10. Specifications
The key specifications of the LinkIt Smart 7688 Duo development board are shown in Table 8.
Category
MPU
MCU
PCB Size
Memory
Power Source
GPIO
PWM
This document contains information that is proprietary to MediaTek Inc.
Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.
MediaTek LinkIt™ Smart 7688 Developer's Guide
Figure 9 Moving a resistor to access JTAG mode
Feature
Chipset
Core
Clock speed
Working voltage
Chipset
Core
Clock speed
Working voltage
Dimensions
Flash
RAM
USB Power
VCC
Pin Count
Voltage
Pin Count
Voltage
Max. Resolution
Maximum Frequency@
Resolution
© 2015, 2016 MediaTek Inc.
LinkIt Smart 7688 Duo
MT7688AN
MIPS24KEc
580MHz
3.3V
ATmega32U4
Atmel AVR
8MHz
3.3V
60.8 x 26 mm
32MB
128MB DDR2
5V (USB micro-B)
3.3V (Pin Breakout)
3 (MT7688AN)
24 (ATmega32U4)
3.3v
8 (ATmega32U4)
3.3v
16 bits (customizable)
31.25kHz@8-bit
Timer 0 (4 sets)
2MHz@2-bit
122Hz@16-bit
Page 23