spak302ag33c Freescale Semiconductor, Inc, spak302ag33c Datasheet - Page 4

• Manufacturer Part Number: spak302ag33c
• Description: Mc68302 Integrated Multi-protocol Processor
• Manufacturer: Freescale Semiconductor, Inc

stored in a parallel EEPROM on the external PCMCIA bus. An additional chip select is provided to support
access to an external device from the PC Card interface.
The MC68SC302 also has up to 12 general purpose I/O pins to connect to external circuits. Five external chip
interrupts can be brought in and routed through a built-in interrupt controller to any one of 11 ISA interrupts (or
to the PC Card interface interrupt). The MC68SC302 can be clocked at the same rate as the physical layer
transceiver clock which eliminates the need for a dedicated oscillator or crystal.
Figure 2 shows the 68SC302 in an NT1 terminal adaptor (TA) application using the MC68SC302. The TA
supports a basic rate interface (BRI). The 68SC302 is connected gluelessly to the ISA bus connector and
performs the Plug and Play interface using the serial EEPROM for storage of non-volatile Plug and Play data.
Data and control accesses from the PC to the MC68SC302 can be selectively memory or I/O mapped. Only
one clock source (crystal or oscillator) is needed for a simple terminal adaptor.
COMMUNICATIONS
PROCESSOR
SCC1
Freescale Semiconductor, Inc.
NMSI PINS
For More Information On This Product,
NMSI I/F
MC68SC302 PRODUCT INFORMATION
SCC2
REFERENCE DESIGNS
IDL/GCI INTERFACE
Figure 1. MC68SC302 Block Diagram
Go to: www.freescale.com
1536 BYTE
RAM
SCC3
IDL/GCI PINS
2 SMCs
PIO AND INTERRUPT PINS
PIO AND INT I/F
SCP/E
INTERFACE
INTERFACE
ISA PnP
PCMCIA
2
PROM INTERFACE
SCP
ISA PnP/
PCMCIA
INTERFACE