Signa! Name
UIOI Pin No.
Signa! Description
CIOCK8
34
Period 125ns (8MHz)
RST
37
IHI
HLT 36 HI
Troubleshooting in Free Run Mode
Due to the asynchronous behavior of the micro-processor, no signal
is available from which the oscilloscope can be triggered. The states
and activities of the different signals can, however , be monitored to
indicate which component could be defective.
Free Run Signals on Schematic 1A
Signa! Name
Chip
Pin No.
Signa! Description
CLK16 U110
2 16Mhz
LMR U108 8
HI
CLK8
U110 14 8MHz
CLK4
U110 13 4MHz
LPOR U109 5
HI
HRLW U104
2
HI
LRHW
U104 1 LO
LDS U103 5
active
LREAD U103 6
active
HREAD U104
4
active
LWRITE U103 8
HI
LDWR
UI03
11 HI
PAO - PA16
address activities
LMEMOS - LMEM5S HI, then pulses far approx.
l s
LIDS
HI, then pulses far approx. l s
LENHS HI, then pulses far approx.
l s
PDO-PD7 data activities
Troubleshooting 4-5
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