AXIOMTEK AX12270, User Manual

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AX12270 PC/104 Module Series User’s Manual
Digital I/O 61
A p p e n d i x B
Digital I/O
Digital I/O Software Programming
z GPI program sample:
O 2E 87
Extended Functions Enable Register
O 2E 87
Extended Functions Enable Register
o 2e 07
EFIR=EFER (Extended Functions Index
Register) point to Logical Device Number
Reg.
o 2f 07
EFDR=EFIR+1 (select logical device 7,
GPIO in logical device 7 )
O 2E 29
Select CR29
o 2f 80
(Define the PINs to be GPIO or Game Port
1) "80" Pin121 ~ 128 set GPIO
o 2e 30 Select CR30 (Active or inactive)
o 2f 01 Set 01 (Active), 00 (inactive)
o 2e f0
Select CRF0 (Set the PINs to be GPO or
GPI Function)
o 2f ff Set the PINs to be GPI
o 2e f1
Select CRF1 (Set the PINs to be Read
only??)
i 2f Show the PINs Status
FE
Indicate GPO15 (CN15 Pin3) tie Low ,
other ties, High
q Quit debug