SCN68661 datasheet(9/19 Pages) PHILIPS

9 / 19 page

Philips Semiconductors

Product specification

SCN2661/SCN68661

Enhanced programmable communications

interface (EPCI)

1994 Apr 27

Table 4.

68661 Register Addressing

R/W

FUNCTION

3-State data bus

Read receive holding register

Write transmit holding register

Read status register

Write SYN1/SYN2/DLE registers

Read mode register 1/2

Write mode register 1/2

Read command register

Write command register

LOAD

MODE REGISTER 1

LOAD

MODE REGISTER 2

SYNCHRONOUS?

LOAD

SYN 1 REGISTER

DOUBLE

SYNC?

LOAD

SYN 2 REGISTER

TRANSPARENT

MODE?

LOAD

DLE REGISTER

INITIAL RESET

TRANSPARENT

MODE?

LOAD

COMMAND REGISTER

OPERATE

RECONFIGURE?

DISABLE

RCVR AND XMTR

NOTE:

SYN1 Register must be written

before SYN2 can be written, and

SYN2 before DLE can be written.

NOTE:

Mode Register 1 must be written

before 2 can be written. Mode Register 2

need not be programmed if external

clocks are used.

SD00079

Figure 1. 68661 Initialization Flowchart

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