SC28L202 datasheet(25/77 Pages) PHILIPS

25 / 77 page

Philips Semiconductors

Objective specification

SC28L202

Dual UART

2000 Feb 10

PROGRAMMING THE HOST INTERFACE

Writing control words into the appropriate registers programs the

operation of the DUART. Operational feedback is provided via status

registers that can be read by the CPU. The addressing of the

registers is described in the Register Map.

The contents of certain control registers are initialized to zero on

RESET. Care should be exercised if the contents of a register are

changed during operation, since certain changes may cause

operational problems.

For example, changing the number of bits per character while the

transmitter is active may cause the transmission of an incorrect

character. In general, the contents of the MR, the CSR, and the

OPCR should only be changed while the receiver(s) and

transmitter(s) are not enabled, and certain changes to the ACR

should only be made while the C/T is stopped.

Each channel has 3 mode registers (MR0, 1, 2) which control the

basic configuration of the channel. Mode, command, clock select,

and status registers are duplicated for each channel to provide total

independent operation and control. Refer to Table 2 for register bit

descriptions.

SC28L202 Datasheet(PDF) 25 Page - NXP Semiconductors