If I put the HD44780 into a read mode its pins become outputs. If I do not tristate the 74HC595 driving it, will the pin pairs with 1's and 0's flow enough current to burn out either the LCD driver or the 595?
If so would putting current limiting resistors between the 595 and LCD prevent the problem?
FWIW the attached schematic shows how I would like to read the busy flag back through the 595's clock line. The LCD and the 595 will attempt to drive each other while I do the shifts to tristate the 595. While debugging it is possible that the program may be halted with both driving.
If so would putting current limiting resistors between the 595 and LCD prevent the problem?
FWIW the attached schematic shows how I would like to read the busy flag back through the 595's clock line. The LCD and the 595 will attempt to drive each other while I do the shifts to tristate the 595. While debugging it is possible that the program may be halted with both driving.