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4.1. Register Structure and Format
The most important issue in programming the PCL720 is understanding the
meaning of the 8 registers addressable from the selected I/O port base address.
The following diagram shows the relative location of each register as to the
base address and its usage.
Note :
- LSB means least significant byte
- MSB means most significant byte
------------------------------------
base +0
base +1
base +2
base +3
base +4
base +5
base +6
base +7
The format and structure of each register are discussed as follows.
Note :
- Bit 0 is the least significant bit.
- OP stands for operation.
base +0
If OP=write, bit 0-7 correspond to channel 0-7 of the 32
base +1 If OP=read, bit 0-7 correspond to D/I channel 8-15.
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CHAPTER 4 PROGRAMMING
Write
D/O 0 - 7
D/O 8 - 15
D/O 16 -23
D/O 24 - 31 D/I 24 -31
LSB or MSB of COUNTER 0
LSB or MSB of COUNTER 1
LSB or MSB of COUNTER 2
CONTROL BYTE
If OP=read, bit 0-7 of this byte correspond to channel 0-7
of the 32 digital input channels.
digital output channels.
Read
D/I 0 – 7
D/I 8 -15
D/I 16 -23
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