Jameco Electronics 3000 Benutzerhandbuch
User’s Manual
137
9.5 Parallel Port E
Parallel Port E, shown in Figure 9-2, has eight I/O pins that can be individually pro-
grammed as inputs or outputs. PE7 is used as the slave port chip select when the slave port
is enabled. Each of the port E outputs can be configured as an I/O strobe. In addition, four
of the port E lines can be used as interrupt request inputs. The output registers are cas-
caded and timer-controlled, making it possible to generate precise timing pulses.
grammed as inputs or outputs. PE7 is used as the slave port chip select when the slave port
is enabled. Each of the port E outputs can be configured as an I/O strobe. In addition, four
of the port E lines can be used as interrupt request inputs. The output registers are cas-
caded and timer-controlled, making it possible to generate precise timing pulses.
Figure 9-2. Parallel Port E Block Diagram
PE7
PE4
I/O Data
perclk/2
Timer A1
Timer B1
Timer B2
perclk/2
Timer A1
Timer B1
Timer B2
PE3
PE0
I6
/scs
Inputs
I4
I7
I5
I2
I0
I3
I1
INT1
INT0
INT1
INT0