11-8
EZ I/O
PC-510 user’s manual
Write EZ I/O 1
Function:
efh
Subfunction:
01h
Purpose:
To write a value of an EZ I/O port.
Calling registers:
AH
efh
AL
01h
DI
Port A mask and data
xxxxxxxx
xxxxxxxxB
xxxxxxxx
Mask for port A; 1->bit to be changed
xxxxxxxxB
Data for port A
BX
Port B mask and data
xxxxxxxx
xxxxxxxxB
xxxxxxxx
Mask for port B; 1->bit to be changed
xxxxxxxxB
Data for port B
CX
Port C mask and data
xxxxxxxx
xxxxxxxxB
xxxxxxxx
Mask for port C; 1->bit to be changed
xxxxxxxxB
Data for port C
DX
ffffh
Return registers: Carry flag cleared if successful
Carry flag set if error
AL
Error code
Comments:
This function is used to initialize the first EZ I/O
(i.e., the EZ I/O that has the higher I/O address
when two EZ I/O chips are present on a board).
Programming example:
/* Inline assembly code for Borland C++ 3.1 */
asm {
mov ax,0ef01h
mov di,00ffh /*port A: no change */
mov bx,8000h /*port B: bit 7=0, other bits unchanged*/
mov cx,0202h /*port C: bit 1=1, other bits unchanged*
mov dx,0ffffh
int 17h
}
Read EZ I/O 1
Function:
efh
Subfunction:
02h
Purpose:
To read from an EZ I/O port.
Calling registers:
AH
efh
Summary of Contents for PC-510
Page 7: ...Notice to user PC 510 user s manual ...
Page 17: ...xii Contents PC 510 user s manual ...
Page 23: ...About this manual PC 510 user s manual ...
Page 25: ...Overview of Section 1 PC 510 user s manual ...
Page 35: ...2 2 Quick start PC 510 user s manual Figure 2 1 PC 510 component diagram ...
Page 45: ...2 12 Quick start PC 510 user s manual ...
Page 55: ...3 10 SETUP programs PC 510 user s manual ...
Page 59: ...4 4 Save and run programs PC 510 user s manual ...
Page 61: ...Overview of Section 2 PC 510 user s manual ...
Page 73: ...5 12 Serial ports PC 510 user s manual ...
Page 77: ...6 4 LPT1 parallel port PC 510 user s manual ...
Page 83: ...7 6 Console devices PC 510 user s manual ...
Page 119: ...13 8 CRTs and flat panels PC 510 user s manual ...
Page 123: ...14 4 GPS interface PC 510 user s manual ...
Page 125: ...15 2 PC 104 expansion PC 510 user s manual ...
Page 127: ...Overview of Section 3 PC 510 user s manual ...
Page 131: ...16 4 Watchdog timer and hardware reset PC 510 user s manual ...
Page 147: ...18 8 Transferring files remote disks PC 510 user s manual ...
Page 177: ...21 22 CPU power management PC 510 user s manual ...
Page 181: ...22 4 Troubleshooting PC 510 user s manual ...
Page 183: ...Overview of Section 4 PC 510 user s manual ...
Page 203: ...A 20 Technical data PC 510 user s manual ...
Page 231: ...B 28 Software utilities PC 510 user s manual ...