HT85F2270 datasheet(202/226 Pages) HOLTEK

202 / 226 page

Rev. 1.00

�0� of ��6

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

S0CON Register – UART0 Control register

SFR Address: 98h

Bit

Name

S�0

S�1

S��0

REN0

TB80

RB80

TI0

RI0

R/W

POR

Bit 7~6

SM0, SM1: UART0 Operating mode select bits

00: Mode 0

01: Mode 1

10: Mode 2

11: Mode 3

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

mode1 and mode 3, the variable baud rate is dependent on the system clock, the baud

rate clock source and the prescaler selections. Operating mode details are described

elsewhere.

Mode

Mode Name

Baud Rate

Synchronisation

�ode 0

8-bit shift register

fSYS/1�

S�nchronous

�ode 1

8-bit UART

Variable

As�nchronous

�ode �

9-bit UART

SP0CLK/�� or

SP0CLK/64

As�nchronous

�ode �

9-bit UART

Variable

As�nchronous

Note that the SP0CLK is described in the UART0 Baud Rate Setup section.

Bit 5

SM20: Multiprocessor communication enable control

0: Disable

1: Enable

Refer to the UART0 Multiprocessor Communication section for details.

Bit 4

REN0: UART0 serial data reception enable control

0: Disable

1: Enable

Bit 3

TB80: Ninth Transmit bit assignment

0: Low

1: High

This bit is only available in Mode 2 and Mode 3. It is not effective in Mode 0 and Mode

1. The bit is assigned using the application program.

Bit 2

RB80: Ninth Receive bit assignment

0: Low

1: High

This bit is used to assign the level of the ninth bit in Mode 2 and Mode 3. In mode 1, if

the SM20 bit is zero, the RB80 bit is assigned as the level of the received stop bit. It is

not available in Mode 0.

Bit 1

TI0: UART0 transmit interrupt flag

0: No interrupt request

1: Interrupt request

This bit must be cleared using the application program.

Bit 0

RI0: UART0 receive interrupt flag

0: No interrupt request

1: Interrupt request

This bit must be cleared using the application program.

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