80C186EB/80C188EB Microprocessor User's Manual - CEUNES

SERIAL COMMUNICATIONS UNIT$mod186nameexample_slave_1_routine;**************************************************************;; slave_1;; FUNCTION: This function represents a slave unit connected to a multi-; processor master/slave network. This slave responds to two; commands:; Flash the LEDs on the EVAL Board, and; Disconnect from the Network.; Other commands are easily added.;; SYNTAX: extern void far slave_1(void);;; INPUTS: None;; OUTPUTS: None;; NOTE: Parameters are passed on the stack as required by high-level; languages. The slave should be running this code before the; master calls the slave. Example assumes PCB is in I/O space.;**************************************************************;substitute register offsets in place of xxxxhP1CON equ xxxxh ;Port 1 Control registerP1LTCH equ xxxxh ;Port 1 Latch registerP2CON equ xxxxh ;Port 2 Control registerS1CON equ xxxxh ;Serial Port 1 Control registerS1STS equ xxxxh ;Serial Port 1 Status registerS1TBUF equ xxxxh ;Serial Port 1 Transmit BufferS1RBUF equ xxxxh ;Serial Port 1 Receive Bufferlib_80186segment public 'code'assume cs:lib_80186My_Address equ 01h ;slave 1 network addressTriStateEna equ 08h ;Tri-state buffer enableTriStateDis equ 00h ;Tri-state buffer disableFlashLEDs equ 01h ;list of commands unit 1 responds toDisconnect equ 0fhpublic_slave_1_slave_1 proc farpush ax ;save registers that will be modifiedpush bxpush cxpush dxExample 10-5. Master/Slave — The slave_1 Routine10-32