Phytec miniMODUL-537, Руководство по оборудованию

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miniMODUL-537
42
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PHYTEC Meßtechnik GmbH 2001 L-006e_2
6.8.2 Program for SERIAL1
; Example of initialization of SERIAL1 for 19200 baud
; for 11.059 MHz system-clock frequency.
init: mov S1REL,#238 ; Reload value for 19200 baud
mov S1CON,#92H ; Mode-adjustment and initialization
; of the flag RI1 ; and TI1, 8 data
bit,
; no parity 1 start bit, 1 stop bit
; Set TI1, erase RI1
init_end: ...
...
ch1_in: ; Subroutine for reading a character from SERIAL1
mov a,S1CON
jnb ACC.0,ch_in ; Wait until character received
anl S1CON,#0FEH ; Reset RI1
mov a,S1BUF
ret ; character in ACC
ch1_out: ; Subroutine for outputting a character
; Output character in ACC
push ACC
w_out: mov a,S1CON
jnb ACC.1,w_out ; wait until TI1 ready for transmission
anl S1CON,#0FDH ; Reset TI1
pop ACC
mov S1BUF,a
ret