6522 Datasheet | Commodore

DESCRIPTION The 6522 Versatile Interface Adapter (VIA) provides all of the capability of the 6520.1 n addition, this device contains a pair of very powerful interval timers, a serial-to-parallellparallel-to-serial shift register and input data latching on the peripheral ports. Expanded handshaking capability allows control of bi-directional data transfers between VIA's in multiple processor systems. Control of peripheral devices is handled primarily through two 8-bit bi-directional ports. Each of these lines can be programmed toactaseitheran inputoran output.Also, several peripheral I/O lines can be controlled directly from the interval timers for generating programmable-frequency square waves and for counting externally generated pulses. To facilitate control of the many powerful features of this chip, the internal registers have been organized into an interrupt...