When simulating SN8P2722, why there is no BUZZER output in the simulator's P0.4 pin?
For real chip, SN8P2722 P0.4 and BZ pin is multiplexed, but the P0.4 port of emulator
can only simulate general I/O functions, and BUZZER function will be output by LCD_DAT
on emulator. When simulate BUZZER function, make sure that the buzzer is connected
with the simulator LCD_DAT, if there is still no output when connection is in right
circumstances, user should check whether the BZM related register settings are correct
in program.