CS89712 datasheet(99/170 Pages) CIRRUS

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CS89712

DS502PP2

3.10.2 UBRLCR1–2 UART1–2 Bit Rate and Line Control Registers

(address 0x8000.04C0 and 0x8000.14C0)

The bit rate divisor and line control register is a 19-bit read / write register. Writing to these registers sets the bit rate

and mode of operation for the internal UARTs.

31:19

18:17

11:0

WRDLEN

FIFOEN

XSTOP

EVENPRT

PRTEN

BREAK

Bit rate divisor

Bit

Description

0:11

Bit rate divisor: This 12-bit field sets the bit rate. If the system is operating from the PLL clock,

then the bit rate divider is fed by a clock frequency of 3.6864 MHz, which is then further divided

internally by 16 to give the bit rate. The formula to give the divisor value for any bit rate when

operating from the PLL clock is: Divisor = 230400 / (bit rate divisor + 1). A value of zero in this

field is illegal when running from the PLL clock. The tables below show some example bit rates

with the corresponding divisor value.The table below shows the bit rates available for 18.432 MHz

operation.

BREAK: Setting this bit will drive the TX output active (high) to generate a break.

PRTEN: Parity enable bit. Setting this bit enables parity detection and generation

EVENPRT: Even parity bit. Setting this bit sets parity generation and checking to even parity,

clearing it sets odd parity. This bit has no effect if the PRTEN bit is clear.

XSTOP: Extra stop bit. Setting this bit will cause the UART to transmit two stop bits after each

data byte, while clearing it will transmit one stop bit after each data byte.

FIFOEN: Set to enable FIFO buffering of RX and TX data. Clear to disable the FIFO (i.e., set its

depth to one byte).

Divisor Value

Bit Rate Running

From the PLL Clock

—

115200

76800

57600

38400

19200

14400

9600

2400

191

1200

2094

110

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