Clock oscillation I/Os for CRT display.
Oscillation frequency is set using the external L and C.
Crystai connectors for system clock oscillation. When the clock is
supplied externally, input to EXTAL; opposite phase clock should be
input to XTAL.
Low-level active, system reset. RST is an I/O, from whlch Low level is
output when the built-in power-on reset function is activated at the rise
of power on. (Mask option)
Microprocessor mode input. For this device, this pin must be grounded.
GND. Both Vss must be grounded.