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Control Word Register

Control Word Format
D7 D6 D5 D4 D3 D2 D1 D0
SC1 SC0 RL1 RL0 M2 M1 M0 BCD

SC-Select Counter The SC0 and SC1 bits of the control word select a counter.The selection of counters  is given below:
SC1 SC0 Select Counter
0
0
1
1
0
1
0
1
Select Counter-0
Select Counter-1
Select Counter-2
Illegal

RL-Read/Load  The RL0 and RL1 are used to load/read counts as follows:
RL1 RL0 Read /Load
0
0
1
1
0
1
0
1
Counter latching operation
Read/Load least significant byte only
Read/Load most significant byte only
Read/Load least significant byte first, then most significant byte


M-Mode Mode selecting bits M0,M1 and M2 select any one of six modes as given below:
M2 M1 M0 Mode
0
0
X
X
1
1
0
0
1
1
0
0
0
1
0
1
0
1
Mode-0
Mode-1
Mode-2
Mode-3
Mode-4
Mode-5

BCD

  0     Binary Counter, 16-bits
  1     Binary Coded Decimal(BCD) counter (4 Decade)





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