MC6821 Datasheet (Motorola) - PERIPHERAL INTERFACE ADAPTER

MC6821, PERIPHERAL INTERFACE ADAPTER

MC6821 PERIPHERAL INTERFACE ADAPTER (PIA) The MC6821 Peripheral Interface Adapter provides the universal means of interfacing peripheral equipment to the M6800 family of microprocessors.

This device is capable of interfacing the MPU to peripherals through two 8-bit bidirectional peripheral data buses and four control lines.

No external logic is required for interfacing to most peripheral devices.

The functional configuration of the PIA is programmed by the MPU during system initialization.

Each

MC6821 Features

* FIGURE 13 - INTERRUPT PULSE WIDTH AND IRQ RESPONSE

* Assumes part was deselected during any previous E pulse.

* Assumes Interrupt Enable Bits are set. Note: Timing measurements are referenced to and from a low voltage of 0.8 volts and a high voltage of 2.0 volts, unless otherwise noted