Philips Semiconductors

Product specification

SCN2652/SCN68652

Multi-protocol communications controller (MPCC)

1995 May 01

13

Table 4.

MPCC Register Addressing

A2

A1

A0

REGISTER

Byte = 0

0

0

X

RDSR

0

1

X

TDSR

1

0

X

PCSAR

1

1

X

PCR*

Byte = 1

0

0

0

0

0

1

0

1

0

0

1

1

1

0

0

1

0

1

1

1

0

1

1

1

NOTES:

* PCR lower byte does not exist. It will be all “0”s when read.

** Corresponding high and low order pins must be tied together.

Table 5.

Parameter Control Register (PCR)–(R/W)

BIT

NAME

MODE

FUNCTION

00–07

Not Defined

08–10

RxCL

BOP/BCP

Receiver character length is loaded by the processor when RxCLE = 0. The character length is

valid after transmission of single byte address and control fields have been received.

10

9

8

Char length (bits)

00

0

8

00

1

1

01

0

2

01

1

3

10

0

4

10

1

5

11

0

6

11

1

7

11

RxCLE

BOP/BCP

Receiver character length enable should be zero when the processor loads RxCL. The

remaining bits of PCR are not affected during loading. Always 0 when read.

12

TxCLE

BOP/BCP

Transmitter character length enable should be zero when the processor loads TxCL. The

remaining bits of PCR are not affected during loading. Always 0 when read.

13–15

TxCL

BOP/BCP

Transmitter character length is loaded by the processor when TxCLe = 0. Character bit length

specification format is identical to RxCL. It is valid after transmission of single byte address and

control fields.