Spectra PowerTwin P08C-AL-SR, User Manual

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User Manual
Spectra PowerTwin PE3950/PN4200 Apollo + sunreadable Displays
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5.1.1.4 Sample Code in C Language
5.1.1.4.1 Control of GP74 to GP77 (DI1 ~ DI4)
#define AddrPort 0x4E
#define DataPort 0x4F
<Enter the Extended Function Mode>
WriteByte(AddrPort, 0x87)
WriteByte(AddrPort, 0x87)
// Must write twice to enter Extended mode
<Select Logic Device>
WriteByte(AddrPort, 0x07)
WriteByte(
data Port, 0x06) //Select logic device 06h
<Input Mode Selection> //Set GP74 to GP77 input Mode
WriteByte(AddrPort, 0x80) // Select configuration register 80h
Write Byte(DataPort, 0x0X ) //Set (bit 4~7) = 0 to select GP 74~77 as Input mode
< input Value>
WriteByte(AddrPort, 0x82) // Select configuration register 82h
Read Byte(DataPort, Value) // Read bit 4~7(0xFx)= GP74 ~77 as High
<Leave the Extended Function Mode>
WriteByte(AddrPort, 0xAA)