C&T Solution CT-DBT0x, User Manual

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CT-DBT0X l User’s Manual
Registers Description
GPIO Input / Output Select

GPIO8x Configuration Registers
(Index port=0xA00, Data port=0xA01, Offset=0x88)
Note.
Bit X = 0 means Input Mode
Bit X = 1 means Output Mode
GPIO Output Data Select

GPIO Output Data Register
(Index port=0xA00, Data port=0xA01, Offset=0x89)
Note.
Bit X = 0 outputs 0 when in output mode
Bit X = 1 outputs 1 when in output mode
3.11 Watchdog Timer
3.11.1 Board Design
The Watchdog Timer (WDT) is implemented by Fintek F81866AD-I.
3.11.2 Psuedo Code

Set WDT Time Unit (Second Unit)

Set WDT Timer Value

Enable WDT
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Chapter 3: Features & Interface
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
GPO3 GPO2 GPO1 GPO0 GPI3 GPI2 GPI1 GPI0
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
GPO3 GPO2 GPO1 GPO0 GPI3 GPI2 GPI1 GPI0
Register Address
WDT Base Address 0xA10
Step1: ByteData = ReadIOByte(0xA15)
Step2: ByteData = ByteData & 0xF7
Step3: WriteIOByte(0xA15, ByteData)
//Read current setting
//Set time unit to “second”
//Write back
Step1: WriteIOByte(0xA16, Time) //Set watch dog time value
Step1: ByteData = ReadIOByte(0xA15)
Step2: ByteData = ByteData | 0x20
Step3: WriteIOByte(0xA15, ByteData)
//Read current setting
//Enable WDT
//Write back