S E R I A L C O N T RO L M O D U L E : U A RT

Receive Character GAP Control register

Bits

Access

Mnemonic

Reset

Description

 

 

 

 

Transmit idle

D01

R/W1TC

TX_IDLE

0

 

 

 

 

Indicates that the transmitter has moved from the active

 

 

 

 

state to the idle state. The transmitter moves from the active

 

 

 

 

state to the idle state when the transmit FIFO is empty and

 

 

 

 

the transmitter is not actively shifting out data.

 

 

 

 

 

D00

R/W1TC

RX_IDLE

0

Receive idle

 

 

 

 

Indicates that the receiver has moved from the active state

 

 

 

 

to the idle state. The receiver moves from the active state to

 

 

 

 

the idle state when a start bit has not been received after the

 

 

 

 

previous stop bit.

 

 

 

 

 

R e c e i v e C h a r a c t e r G A P C o n t r o l r e g i s t e r

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Address: 9001_100C / 9001_900C / 9002_100C / 9002_900C

The Receive Character GAP Control register configures the receive character gap control logic.

Register

REGISTER

 

 

 

 

Register bit

 

 

 

 

 

assignment

Bits

Access

Mnemonic

Reset

Description

 

 

 

 

 

Enable receive character gap timer

 

D31

R/W

ENABLE

0

 

 

 

 

 

Write a 1 to this field to enable the receive character gap

 

 

 

 

 

timer.

 

 

 

 

 

 

 

D30:25

R/W

Not used

0x0

Write this field to 0.

 

 

 

 

 

 

 

D24:00

R/W

VALUE

0

Value

 

 

 

 

 

Defines the period between receiving the stop bit and

 

 

 

 

 

asserting the character gap timeout event.

Use this equation to compute the required divisor value: N = ((FCLK * gap+period) - 1)

FCLK = Nominal 29.4912 MHz

gap_period = Desired character gap period

A reasonable setting is 10 bit periods one character plus the start and stop bits. Given a data rate of 115,200bps, the desired period is 86.8us and the timeout value is 2559d.

398Hardware Reference NS9215

Page 398
Image 398
Digi NS9215 manual Transmit idle, Receive idle, Enable receive character gap timer, Write this field to, Value

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