HT85F2270 datasheet(212/226 Pages) HOLTEK

212 / 226 page

Rev. 1.00

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

S1CON Register – UART1 Control register

SFR Address: 9Bh

Bit

Name

S�

—

S��1

REN1

TB81

RB81

TI1

RI1

R/W

—

R/W

POR

—

Bit 7

SM: UART1 Operating mode select bit

0: Mode A

1: Mode B

The following table illustrates the corresponding mode descriptions and baud rates.

Operating mode details are described elsewhere.

SM bit

Mode

Mode Name

Baud Rate

Synchronisation

�ode A

9-bit UART

Variable

As�nchronous

�ode B

8-bit UART

Variable

As�nchronous

Bit 6

Unimplemented, read as “0”

Bit 5

SM21: Multiprocessor communication enable control

0: Disable

1: Enable

Refer to the UART1 Multiprocessor Communication section for details.

Bit 4

REN1: UART1 serial data reception enable control

0: Disable

1: Enable

Bit 3

TB81: Ninth Transmit bit assignment

0: Low

1: High

This bit is only available in Mode A. It is not effective in Mode B. The bit is assigned

using the application program.

Bit 2

RB81: Ninth Receive bit assignment

0: Low

1: High

This bit is used to assign the level of the ninth bit in Mode A. In mode A, if the SM21

bit is zero, the RB81 bit is assigned as the level of the received stop bit. It is not

available in Mode B.

Bit 1

TI1: UART1 transmit interrupt flag

0: No interrupt request

1: Interrupt request

This bit must be cleared using the application program.

Bit 0

RI1: UART1 receive interrupt flag

0: No interrupt request

1: Interrupt request

This bit must be cleared using the application program.

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