SC28L201 datasheet(51/110 Pages) NXP

51 / 110 page

9397 750 13138

Product data sheet

Rev. 01 — 31 October 2005

51 of 110

Philips Semiconductors

SC28L201

3.3 V, 5 V UART, 3.125 Mbit/s, with 256-byte FIFO

8.2.6 Command Register Extension (CRx)

CR is used to write commands to the UART.

Table 23:

CRx - Command Register Extension (address 0x12) bit description

Bit

Symbol

Description

Lock Tx and Rx enables.

0 = lock Rx and Tx state. Prevents changing transmitter and receiver

enable bits while writing to the lower 5 bits of the command register. Bits

CR[6:5] are not changed.

1 = change Rx and Tx state. Allows the receiver and transmitter enable

bits to be changed while issuing a command to the Command Register.

Remark: Receiver or transmitter disable is not the same as receiver or

transmitter reset.

Writes to the lower 5 bits of the CR would usually have CR[7] at ‘0’ in

order to maintain the enable/disable condition of the receiver and transmitter.

The bit provides a mechanism for writing commands to a channel, via

CR[4:0], without the necessity of keeping track of or reading the current

enable status of the receiver and transmitter.

Enable Tx. Enable transmitter.

0 = disable

1 = enable

A one written to this bit enables operation of the transmitter. The TxRDY

status bit will be asserted. When disabled by writing a zero to this bit, the

command terminates transmitter operation and resets the TxRDY and

Tx Idle status bits returning the transmitter to its idle state. However, if a

character is being transmitted or if characters are loaded in the TxFIFO when

the transmitter is disabled, the transmission of the all character(s) is

completed before assuming the inactive state.

Enable Rx. Enable receiver.

0 = disable

1 = enable

A one written to this bit enables operation of the receiver. The receiver

immediately begins the search for and the veriﬁcation the start bit. If a zero is

written, this command terminates operation of the receiver immediately-a

character being received will be lost. The command has no effect on the

receiver status bits or any other control registers. The data in the RxFIFO will

be retained and may be read. If the receiver is re-enabled subsequent data

will be appended to that already in the RxFIFO. If the special Wake-up mode

is programmed, the receiver operates even if it is disabled (see Section

7.4.7.6 “Wake-up mode”).

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