Advantech PCM-3718 Series User Manual page 63

RW1 & RW0
Operation
Counter latch
Read/write LSB
Read/write MSB
Read/write LSB first, then MSB
M2, M1 & M0
M2
0
0
X
X
1
1
BCD
BCD
0
1
If you set the module for binary counting, the count can be any number
from 0 up to 65535. If you set it for BCD (Binary Coded Decimal) count-
ing, the count can be any number from 0 to 9999.
If you set both SC1 and SC0 bits to 1, the counter control register is in
read-back command mode. The control register data format becomes:
BASE+15 - 8254 control, read-back mode
Bit
Value 1
PCM-3718 Series User Manual
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Select read/write operation
Select operating mode
M1 M0
0 0
0 1
1 0
1 1
0 0
0 1
Select binary or BCD counting
Type
Binary counting 16-bits
Binary coded decimal (BCD) counting
D7 D6 D5
1 CNT
RW1
0
0
1
1
Mode Description
0 Programmable one shot
1 Programmable one shot
2 Rate generator
3 Square wave rate generator
4 Software triggered strobe
5 Hardware triggered strobe
D4 D3
STA C2
54
RW0
0
1
0
1
D2 D1 D0
C1 C0 X