AS8218 datasheet(106/123 Pages) AMSCO

106 / 123 page

Data Sheet AS8218 / AS8228

Revision 3.0, 31-May-06

Page 106 of 123

UART is dedicated to the SCT block for writing to and reading from other functional blocks such as RTC,

LCDD; besides, it is used for selection of different modes of operation.

SFRs of UART1

There are five special function registers dedicated to the UART1.

Address Description

Read/Write from MCU

SCON

98h

Serial port control register

read & write

SBUF

99h

Serial port buffer register

read & write (separate)

SBAUDL

9Ah

Baudrate reload register – Low address

write only

SBAUDH

9Bh

Baudrate reload register – High address

write only

SOVR

90h

Serial receive buffer overflow register

read & write, only one bit

(=bit0) available

SOVR Register

Serial receive buffer overflow register. If data is received before it has been read out of SBUF then the bit SOV

is set. It can the cleared by software. All other bits of SOVR are 0.

SOVR

MSB

LSB

SOV

Note:

Overflow flag. If ‘1’ then a receiver buffer overflow occurred. The old buffer value has been overwritten by new

incoming data. Set by overflow, cleared by MCU.

SCON Register

The SFR Serial Port Control Register (SCON) is used to configure the UART1 and to check the status of the

transmission.

SCON

MSB

LSB

SM0

SM1

SM2

REN

TB8

RB8

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