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I
HARDWARE PREPARATION
2.3.9 External Timer Select (J13.J14)
Jumper blocks J13 and J14 provide the means to access timers 2 and 3
of the Z8036 timer.
These jumper blocks are designed to allow an
alternate clock source and to allow cascading of the counters. The
alternate clock is 125 KHz, derived from the 4 MHz clock that drives
the clock input of the Z8036 (divide by 32). The factory setting for
J13 and J14 links timers 2 and 3 for diagnostics purposes. Also, the
timer 3 output ;s used as the watch dog timer signal when the system
software configures the Z8036 to perform the watch dog timer
function.
Location monitor 2 is also accessible as an input clock
source to the Z8036. Thi s coul d be set up to count events or perform
synchronizing functions.
Some of the jumper pins are not intended to be jumper configured.
These provide external access to timer 2's trigger and timer 3's
output, trigger, and gate signals. These signals can be connected
to other circuitry via wire-wrap or jumper clip connections. Refer
to the Zilog Z-CIO (Z8036) Counter/Timer And Parallel I/O Unit
Technical Manual for details regarding timer functionality.
2-10
Jumper Blocks J13 and J14
External Timer
1/0
Select
(Optional)
T2 Input
Altclock
Location Monitor
(Factory Setting)
3
5
J13
+-----
0
0
0
0
I
J14
+- -
2
T2 Trigger
4
T2 Output
6
13
Input
o
13
Gate
2
0
13
Trigger
3
0
13
Output
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