User`s manual

PK220026 s Subsystems
Inputs 1114, in addition to the protected digital input function, have the
capabilities listed in Table 3-2.
Inputs 11 and 12 can be used to generate hardware interrupts on the
PK2200 CPU. Input 11 is connected to /INT0 and input 12 is connected
to /INT2. With Dynamic C, you can easily implement service routines for
these interrupts. Table 3-2 lists the alternate functions for digital inputs
11 through 14.
Refer to the Dynamic C Technical Reference Users Manual
for more information on writing interrupt service routines.
Inputs 13 and 14 are connected to the CPUs DMA channels. These
inputs may be used for counting high-speed digital signals. For high-
speed counting (above 5 kHz), remove capacitor network CN2.
Figure 3-4. CN2 Capacitor Networks
Removing CN2 from the PK2240 disables the filtering on
channels IN5, IN6, IN7, IN8, IN13, IN14, IN15, and IN16
The high-speed counters and can perform a variety of functions including
time stamping, pulse width measurement and duty cycle measurement.
Table 3-2. Digital Input 11-14 Alternate Functions
Input Z180 Signal Function
11 /INT0 Interrupt for user programs
12 /INT2 Interrupt for user programs
13 CKA0/DREQ0 DMA channel 0, used for counting
14 /DREQ1 DMA channel 1, used for counting
Mux Mux
EPROM
RAM
Z180
U19
U20
JP5
J3
CN2CN1
Remove CN2 for
high-speed counting
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