MK50H27PLCC datasheet(23/56 Pages) STMICROELECTRONICS

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4.1.2.6 Control and Status Register 5 (CSR5)

CSR5 facilitates control and monitoring of modem controls.

RAP<3:1> = 5

BIT

NAME

DESCRIPTION

15:05

Reserved, must be written as zeroes.

RTSEN

RTS/CTS ENABLE is a READ/WRITE bit used to configure pins 26

and 30. If this bit is set, pin 26 becomes RTS and pin 30 becomes

CTS. RTS is driven low whenever the MK50H27 has data to trans-

mit and is kept low during transmission. RTS will be driven high

after the closing flag of a signal unit is transmited if either no other

frames are in the FIFO or if the minimum signal unit spacing is

higher than 2 (see Mode Register).

The MK50H27 will not begin

transmission and TD will remain HIGH if CTS is high. If RTSEN = 0

then pins 26 and 30 become programmable I/O pins DTR and

DSR. The direction and behavior of DSR and DTR are controlled by

the following bits.

DTRD

DTR DIRECTION is a READ/WRITE bit used to control the direction

of the DTR pin. If DTRD = 0, the DTR pin becomes an input pin and

the DTR bit reflects the current value of the pin; if DTRD = 1, the DTR

pin is an output pin controlled by the DTR bit below.

DSRD

DSR DIRECTION is a READ/WRITE bit used to control the direction

of the DSR pin. If DSRD = 0, the DSR pin becomes an input pin

and the DSR bit reflects the current value of the pin; if DSRD = 1, the

DSR pin is an output pin controlled by the DSR bit below.

DTR

DATA TERMINAL READY is used to control or observe the DTR I/O

pin depending on the value of DTRD. If DTRD = 0, this bit be-

comes READ ONLY and always equals the current value of the DTR

pin. If DTRD = 1, this bit becomes READ/WRITE and any value

written to this bit appears on the DTR pin.

DSR

DATA SET READY is used to control or observe the DSR I/O

pin depending on the value of DSRD. If DSRD = 0, this bit be-

comes READ ONLY and always equals the current value of the DSR

pin. If DSRD = 1 this bit becomes READ/WRITE and any value

written to this bit appears on the DSR pin.

000000

MK50H27

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