rtd DM6210, Руководство пользователя

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4-8
BA + 15: Digital I/O Control (Read/Write 8-bit)
This register is used to set the digital I/O direction and enable the digital inputs to be latched. Reading
this register returns the current settings.
Bit 0 – Sets the direction of the Port 0.0 - Port 0.3 digital lines.
Bit 1 – Sets the direction of the Port 0.4 - Port 0.7 digital lines.
Bit 2 – Sets the direction of the Port 1.0 - Port 1.3 digital lines.
Bit 3 – Sets the direction of the Port 1.4 - Port 1.7 digital lines.
Bit 4 – Enables latch mode for the Port 0 input lines. When this mode is enabled, data can be strobed and
latched into Port 0 on either the rising edge or the falling edge of the strobe signal selected at BA
+ 14.
Bit 5 – Enables latch mode for the Port 1 input lines. When this mode is enabled, data can be strobed and
latched into Port 1 on either the rising edge or the falling edge of the strobe signal selected at BA
+ 14.
Bit 6 – Select Port 0 strobe polarity. This bit has no meaning if latching is disabled on Port 0.
Bit 7 – Select Port 1 strobe polarity. This bit has no meaning if latching is disabled on Port 1.
Port 1 High Direction (P1.4 - P1.7)
0 = input
1 = output
Port 0 Latch Enable
0 = disabled
1 = enabled
Port 1 Latch Enable
0 = disabled
1 = enabled
Port 0 Strobe Polarity
0 = positive edge
1 = negative edge
' ' ' ' ' ' ' '
Port 0 Low Direction (P0.0 - P0.3)
0 = input
1 = output
Port 0 High Direction (P0.4 - P0.7)
0 = input
1 = output
Port 1 Low Direction (P1.0 - P1.3)
0 = input
1 = output
Port 1 Strobe Polarity
0 = positive edge
1 = negative edge