CD1865 datasheet(85/150 Pages) INTEL

85 / 150 page

Intelligent Eight-Channel Communications Controller — CD1865

Datasheet

by hardware or software, the CD1865 does not initialize every register and RAM location to a

defined value. The only sure state is that all channels are inactive, no service requests are pending,

and the Global Interrupt Vector register is FF Hex.

Figure 28. Initialization

INITIALIZATION

MASTER

CHIP

RESET

GLOBAL

INITIALIZATION

CHANNEL

INITIALIZATION

LOAD SCHR1-3, MSVR,

MCOR1-2, TRANSMIT/RECEIVE

LOAD GSVR WITH CHIP ID,

PILRS WITH VECTORS, AND

PRESCALE REGISTERS

LOAD COR1-3 WITH

CHARACTER SETTINGS

ISSUE COR CHANGE

COMMAND IN CCR

LOAD CAR WITH A ‘0’

DONE

GSVR

= FF

CCR

= 0

LAST

CHANNEL

(CAR=8)

INCREMENT CAR

AND OPERATION MODES

After either a hardware reset by the RESET pin or a software reset

by a CCR command, wait until the GSVR= xFF before proceeding

with chip initialization.

When the CD1865 is ready, begin by loading the GSVR with the

the Service Match registers with the vectors that will be used during

service acknowledge cycles. Load the Prescale registers with the

value chosen for the basic time count for timer operations.

In preparation for channel initialization, load the CAR with a ‘0’ to

access Channel Zero registers.

for the CCR to contain a value of zero to ensure that the

CD1865 is not processing a previous change command for that

channel.

Load the Channel Option registers with the values to enable the

desired modes of operation and character parameters such as

parity, stop bits, and so on.

Inform the CD1865 that one or more Channel Option registers

have changed via the COR Change Command.

Option registers for modem interrupt conditions; the MSVR with the

bits in the SRER register for the interrupt conditions desired.

If more channels, go back to the top of the loop.

chip ID if there are more than one CD1865 in the system. Load

states of DTR/RTS as necessary and the baud rate constants for

Transmit and Receive Baud Rate Generators. Set the appropriate

CD1865 Datasheet(PDF) 85 Page - Intel Corporation

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