Datasheet

4337K–USB–04/08

AT89C5130A/31A-M

Reset Value = XXX0 0000b

Not bit addressable

Bit

Number

Bit

Mnemonic Description

7 -

Reserved

The value read from this bit is indeterminate. Do not set this bit

6 -

Reserved

The value read from this bit is indeterminate. Do not set this bit

5 -

Reserved

The value read from this bit is indeterminate. Do not set this bit.

4 BRR

Baud Rate Run Control bit

Cleared to stop the internal Baud Rate Generator.

Set to start the internal Baud Rate Generator.

3 TBCK

Transmission Baud rate Generator Selection bit

for UART

Cleared to select Timer 1 or Timer 2 for the Baud Rate Generator.

Set to select internal Baud Rate Generator.

2 RBCK

Reception Baud Rate Generator Selection bit

for UART

Cleared to select Timer 1 or Timer 2 for the Baud Rate Generator.

Set to select internal Baud Rate Generator.

1 SPD

Baud Rate Speed Control bit

for UART

Cleared to select the SLOW Baud Rate Generator.

Set to select the FAST Baud Rate Generator.

0 SRC

Baud Rate Source select bit in Mode 0

for UART

Cleared to select F

OSC

/12 as the Baud Rate Generator (F

CLK PERIPH

/6 in X2 mode).

Set to select the internal Baud Rate Generator for UARTs in mode 0.