William Roth

Issue - Micro controller stops execution under certain conditions. The Program below will not complete "TEST_LOOP2" "TEST_LOOP3" Never Executes #CHIP 18f27q43, 32 #CONFIG MCLRE = ON, WDTE = OFF #OPTION Explicit #DEFINE LED PORTC.3 Dir LED OUT '''Variables Dim MyDouble as Double Wait 1 s TEST_LOOP1: 'Verify LED with 3 Flashes Repeat 3 Pulseout PORTC.3, 200 ms Wait 200 ms End Repeat Wait 1 s TEST_LOOP2: 'This loop does not complete 2 iterations Repeat 2 MyDouble = 10.00 - 3.140 MyDouble = 0 - 9.10...

Per the Datasheet Page 181 / 11.6 Note: PORTE is unavailable on 28-pin devices.

The demos for the Q20 are located in the folder: ...Vendor_Boards\Great_Cow_Basic_Demo_Board\18Fx6q20_ChipRange_Demonstrations\ However none of these show the use of an external crystal or the any specific config settings that may be required for this range of chips. ( the default settings seem good) As I previously noted, your code is missing the Dir command for the Port.pin My suggestion (for testing) would be to use the internal oscillator and to also set the port direction( required). #chip 18F06Q20,...

OP code is missing port direction for PortC.3. Dir PortC.3 Out

Try this and tell us what happens. Make sure that Vdd is tied to Vddio2 (Pins 1 & 8) #Chip 18F06Q20, 20 #CONFIG FCMEN=ON #CONFIG FEXTOSC=HS //' or try FEXTOSC=HS_24MHZ #CONFIG RSTOSC=EXTOSC Wait 100 ms #Define LED PortC.3 Dir LED Out Do Set LED ON Wait 500 ms Set LED Off Wait 500 ms Loop Edited to add additional option for FEXTOSC

PulseOut is a macro with a minimum time val of 1 microsecond. However, to get what you need ASM can be inserted into the following code as shown below. #CHIP 18F46Q71, 64 wait 100 ms Dir PortC.2 OUT ' ----- Main body of program commences here. do set PortC.2 on nop nop nop nop nop nop nop nop nop set PortC.2 off nop nop nop nop nop nop nop loop This will give you 625ns on and 625ns off @ 64Mhz

This seemed to have resolved the problem. The USARTs now initialize and the ASM looks good. Thanks

Not getting any serial output on 18F46K42, 18F47Q43, etc. Seems to be an issue with usart.h. I swapped out the current usart.h with an older version ( Dec 2022) and it works OK. Attached is my ASM and GCB Code. 2024.08.18 (Windows 64 bit) : Build 1411