~ National ~ Semiconductor - Al Kossow's Bitsavers

.set icu fprt,14 *aO
.set icu-mctl,16 *aO
.set lCu-c1ptr,18 *aO
.set 1cu-pdat,19 *aO
.set iCU-1PS,20 *aO
.set icu-pdir,21 *aO
.set 1Cu-cctl,22 *aO
.set 1CU:C1ctl,23 *aO
.set 1cu_addr,OxftfeOO
t************************* STATIC BASE
.set irl mod, 17*4
• set sbut, Oxle
.set rbuf, Ox41e
.set cbuf, Ox61e
.set intabl., Ox81e
#********************** SET UP DISPATCH
start::
b1cpsrw $(OxlOO)
movd $OxOc,rO
movd $Ox055555555,rl
addr 1ntable(sb),r2
movd $OxOc,r3
svc
sprd 1ntbase,r2
mova 1srent,irl_mod(r2)
t
* i
•
I
i
t
i
#
tFirst ICU register addre~s
t
•
• tDispatch table offset for IRl entry
'sbuf = area used to
tstore data to be transmitted, rbuf
tarea used to store rece1ved data,
tcbuf = area used to store compare
.buffer, 1ntable = base po1nter to the
iinterrupt table
#
TABLE FOR THE 32032 ********************
STARTING LOCATIONS **********************
•#Clear 1ntr's
tset for monitor svc to move 1ntbase
,from ROM to ram becauae you have
tto change the address for the
.interrupt service routine.
tActual svc for move
tPut base addr of 1ntbase in r2
IPut offset of isr into 1st location
tof dispatch table
t
#w******************** LOAD TRANSMITTER BUFFER (FF to 00) **********************
t
senddat: addr sbuf(sb),rO tRO contains str1ng buffer ptr.
movd $O,rl
IRl conta1ns offset
movb $OxOtt,r2 Unit data reg.
sbufloop: movb r2,O(rO)[rl:b] iLoad char. to string buffer
addqw l,rl
tIncrQment offset ptr.
subb $l,r2
IIncrement data
cmpw r.1,$256
.Check for 256 chars. loaded
bne sbufloop
#Jump back 1f not done
I
t*********************** LOAD COMPARISON BUFFER (00 TO FF) *********************
i
compdat: addr cbuf (sb) , rO tRO conta1ns pointer
movd $O,rl
tRl contains offset
movb $O,r2
Unit data reg.
Cbufloop: movb r2,O(rO)[rl:b] tLoad char. to compare buffer
addqw l,rl
IIncrement ptr. offset
addqw l,r2
IDecrement data
cmpw r.1,$256
'Check for 256 chars. loaded
bne Cbufloop
tJump back if not done
i
t*************** SET UP INTERRUPT SERVICE ROUTINE PARAMETERS *******************
movd $16,blk16cnt
I
iInitialize 16 byte block counter
TL/C/9313-21
4-80