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LAUNCHXL2-RM57L: Reading parallel data from a binary counter
Part Number: SN74LV8154
I am using SN74LV8154 binary counter with Hercules RM57Lx LaunchPad. It counts but keeps resetting at 15 or 7 (or sometimes less).
After investigating, I observed that when I remove the RCLK connection for a while and then connect it back, the counts' value it shows is more than 15 (e.g. 20-30, 100, 8852, etc.). I checked multiple times. When RCLK is not connected, it counts fine but resets when RCLK is connected.
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In reply to Clemens Ladisch:
I do not have a clean drawn schematic but the connections are the following:
(left side is SN74LV8154)
Y0-Y7 ----- GIOA 0, 1, 2, 5, 6, 7, GIOB 2, 3VCC ----- 5VGND ----- GNDGAL ----- HET1_2GAU ----- HET1_18GBL ----- HET1_16GBU ----- HET1_30CLKA ----- HET1_22CLKB ----- (not connected)RCLK ----- HET1_14CCLR ----- HET1_4(RCOA and CLKBEN shorted)
Please, find the code attached as well.
In reply to Apurv Mishra:
Your code appears fine. RCLK should not cause the counter to clear, do you have access to an oscilloscope to see if CCLR is glitching low for some reason when RCLK is connected? Also make sure your delay function is meeting the timing requirements for this device.
In reply to Gabriel Lake1:
I connected CCLR to an oscilloscope. Whenever the oscilloscope connection was there, CCLR remained high and the count values kept showing as 0. But when the oscilloscope connection was removed, it counted like before (resetting at 15).
Also, when CCLR is high, the voltage value is around 1.25V. Shouldn't it be 3.3V ?
Thanks and regards,Apurv
This sounds as if CCLR is floating, i.e., HET1_4 does not actually drive a valid voltage. Please check the connection.
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