Rabbit 2000 - 9.5 Parallel Port E

106 Rabbit 2000 Microprocessor
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. Port E has a higher drive than most of the other ports. PE7
is used as the slave port chip select when the slave port is enabled. Each of the port E out-
puts 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 cascaded 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