W65C21S Datasheet, PDF (4/16 Pages) List of Unclassifed Manufacturers – Peripheral Interface Adapter (PIA)

The Western Design Center, Inc.
W65C21S Data Sheet
Figure 3. W65C21S PIA Block Diagram
65xx, 68xx
MICROPROCESSOR
FAMILIES
D0-D7 (8)
PHI2
RWB
RS0
RS1
CS0
CS1
CS2B
RESB
IRQAB
IRQBB
VSS
VCC
W65C21S
PIA
(8) PA0-PA7
CA1
CA2
CB1
CB2
(8) PB0-PB7
PERIPHERAL
DEVICE
A
PERIPHERAL
DEVICE
B
Figure 4. Interface Signals Relationship
The Western Design Center
W65C21S
4