FabiaTech Low Power FB2652, Руководство пользователя

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J5 TTL I/O -Software programming example
The following example is written in Intel 8086 assembly language. It assumes that the
IO port address is located at 2Eh and data port is located at 2Fh. The following is an
Assemble program, which demonstrates how to read/write the TTL IO port
;------------------------------------------------------------------------------------------
; Enter the extended function mode, interruptible double-write
;------------------------------------------------------------------------------------------
Mov dx,2eh
Mov al,87h
Out dx,al
Out dx,al
;------------------------------------------------------------------------------------------------------
; Logical device 7, configuration register CRF1 Bit 0,1(J5-Pin1, 2/GPO1, 2)
;------------------------------------------------------------------------------------------------------
Mov dx,2eh
Mov al,07h
Out
dx,al ;point to Logical Device Number Reg.
Mov dx,2fh
Mov al,07h
Out
dx,al ; select logical device 7
Mov dx,2eh
Mov al,0f1H
Out
dx,al ; select CRF1
Mov dx,2fh
Mov
al,cfh ; Bit o,1 with value 1. (Write GPO1, GPO2 is active to high.)
; Mov al,0cch ; Bit o, 1 with value 0. (Write GPO1, GPO2 is active to low.)
Out dx,al ; update CRF1 with value CFH
;------------------------------------------------------------------------------------------------------
; Logical device 8, configuration register CRF1 Bit 0,1(J5-Pin3, 4/GPI 1,2)
;------------------------------------------------------------------------------------------------------
Mov dx,2eh
Mov al,07h
Out
dx,al ; point to Logical Device Number Reg.
Mov dx,2fh
Mov al,08h
Out
dx,al ; select logical device 8
Mov dx,2eh
Mov al,0f1h
Out
dx,al ; select CRF1
Mov dx,2fh
In
al,dx ; Bit o, 1 with state value. (Read GPI1, GPI2 state.)
; Read CRF1 with value 0XH
;------------------------------------------
; Exit extended function mode
;------------------------------------------
Mov dx,2eh
Mov al,0aah
Out dx,al