Solvline Eddy DKV2.1.0.3 - Manual (Page 37)

Chapter 3. Development
Environment
37
P14 E Start enable signal to read or write the data. IN
2.4.5.3. 16bit I2C Bus GPIO
This 16-bit I2C Bus GPIO (PCA9539) provides general-purpose remote I/O expansion.
Slave address of this chip is set to 0x74 in DK board. and Address can be changed with A1,A0
address input from 0x74 to 0x77.
16-bit I/O is used to Digital Input/Output as below, and this is connected with the Expansion Header
also. If you use for GPIO, it is possible to configure individually.
Function Description I/O
P00-P07 DIO Output, Connected with DO[0:7] OUT
P00 DIO output, DO0
P01 DIO output, DO1
P02 DIO output, DO2
P03 DIO output, DO3
P04 DIO output, DO4
P05 DIO output, DO5
P06 DIO output, DO6
P07 DIO output, DO7
P10-P17 DIO Intput, Connected with DI[0:7] IN
P10 DIO Input, DI0
P11 DIO Input, DI1
P12 DIO Input, DI2
P13 DIO Input, DI3
P14 DIO Input, DI4
P15 DIO Input, DI5
P16 DIO Input, DI6
P17 DIO Input, DI7
/INT Connected with PB16 of Eddy-CPU OUT
2.4.5.4. RTC
- DS1340 (Dallas, I2C interface)
- 12.5pF load capacitance crystal must be used. (Refer to Crystal Spec below)
- Do not use another RTC Chip.
- Backup Battery: CR2032 (235mAh) Lithium Battery.