Zilog Z16C35 User Manual
Page 239
Application Note
SCC in Binary Synchronous Communications
10-9
9
INITIALIZATION ROUTINE FOR Z-SCC
0034
GLOBAL
ENTRY
INIT
PROCEDURE
0634
2100
LD
R0, #15
!NO.OF PORTS TO WRITE TO!
0036
000F
0038
7602
LDA
R2, SCCTAB
!ADDRESS OF DATA FOR PORTS!
003A
004E'
003C
2101
ALOOP:
LD
R1, #WR0A
003E
FE21
0040
0029
ADDB
RL1, @R2
0042
A920
INC
R2
0044
3A22
OUTIB
@Rl, @R2,R0 !POINT TO WR0A,WR1A ETC THRO LOOP!
0046
0018
0048
8D04
TEST
R0
!END OF LOOP?!
004A
EEF8
JR
NZ, ALOOP
!NO, KEEP LOOPING!
004C
9E08
RET
004E
12
SCCTAB:
BVAL
2*9
004F
CO
BVAL
%C0
!WR9=HARDWARE RESET!
0050
08
BVAL
2*4
0051
10
BVAL
%10
!WR4=X1 CLK, 16 BIT SYNC MODE!
0052
14
BVAL
2*10
0053
00
BVAL
0
!WRIO=CRC PRESET ZERO, NRZ,16 BIT SYNC!
0054
0C
BVAL
2*6
0055
AB
BVAL
%AB
!WR6=ANY SYNC CHAR %AB!
0056
0E
BVAL
2*7
0057
CD
BVAL
%CD
!WR7=ANY SYNC CHARR %CD!
0058
04
BVAL
2*2
0059
20
BVAL
%20
!WR2=NT VECTOR %20!
005A
16
BVAL
2*11
005B
16
BVAL
%16
!WR11=TxCLOCK & TRxC OUT=BRG OUT!
005C
18
BVAL
2*12
005D
CE
BVAL
%CE
!WR12= LOWER TC=%CE!
005E
IA
BVAL.
2*13
005F
00
BVAL
0
!WR13= UPPER TC=01
0060
1C
BVAL
2*14
0061
03
BVAL
%03
!WRI4=BRG ON, ITS SRC=PCLK!
0062
1E
BVAL
2*15
0063
00
BVAL
%00
!WRI5=NO EXT INT EN.!
0064
0A
BVAL
2*5
0065
64
BVAL
%64
!WR5= TX 8 BITS/CHAR, CRC-16!
0066
06
BVAL
2*3
0067
Cl
BVAL
&CI
IWR3=RX 8 BITS/CHAR, REC ENABLE!
0068
02
BVAL
2*1
0069
08
BVAL
%C1
!WR1=RxINT ON 1ST OR SP COND!
!EXT INT DISABLE!
006A
12
BVAL
2*9
006B
09
BVAL
%09
!WR9=MIE, VIS, STATUS LOW!
006C
END INIT
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UM011002-0808