CC1010-RTY1 datasheet(68/152 Pages) TI

68 / 152 page

CC1010

SWRS047

Page 68 of 152

SCON1 (0xC0) - Serial Port 1 Control Register

Bit

Name

R/W

Reset value

Description

SM0_1

R/W

SM1_1

R/W

Serial Port 1 mode bits, decoded as:

SM0_1 SM1_1 Mode

0 (Synchronous half duplex)

1 (Asynchronous full duplex, start + stop bit)

2 (Asynchronous full duplex, start + stop bit,

9th data bit)

3 (Asynchronous full duplex, start + stop bit,

9th data bit)

SM2_1

R/W

Multiprocessor communication enable. In modes 2 and 3

SM2_1 = 1 enables the multiprocessor communication feature:

In mode 2 or 3

RI_1 will not be activated if the received 9th bit

is 0. If

SM2_1 = 1 in mode 1 RI_1 will only be activated if a

valid stop bit is received. In mode 0

SM2_1 establishes the

baud rate: when

SM2_1 = 0 the baud rate is clk / 12; when

SM2_1= 1 the baud rate is clk / 4.

REN_1

R/W

Receive enable. When

REN_1 = 1 reception is enabled.

TB8_1

R/W

Defines the state of the 9th data bit transmitted in modes 2 and

RB8_1

R/W

In modes 2 and 3

RB8_1 indicates the state of the 9th bit

received. In mode 1

RB8_1 indicates the state of the received

stop bit. In mode 0

RB8_1 is not used.

TI_1

R/W

Transmit interrupt flag. Indicates that the transmit data word

has been shifted out. In mode 0

TI_1 is set at the end of the

8th data bit. In all other modes

TI_1 is set when the stop bit is

placed on the

TXD1 pin. TI_1 must be cleared by the

software.

RI_1

R/W

Receive interrupt flag. Indicates that a serial data word has

been received. In mode 0

RI_1 is set at the end of the 8th

data bit. In mode 1

RI_1 is set after the last sample of the

incoming stop bit, subject to the state of

SM2_1. In modes 2

and 3

RI_1 is set at the end of the last sample of RB8_1.

RI_1 must be cleared by the software.

16.7.1

MODE 0

Serial mode 0 provides synchronous, half-

duplex serial communication. For serial

port 0, pin RXD0 (P3.0) is used for data

input and output while TXD0 (P3.1)

provides the bit clock for both transmit and

receive.

For

serial

port

the

corresponding pins are RXD1 (P2.0) and

TXD1 (P2.1).

The serial mode 0 baud rate is set by

SCON0.SM2_0 / SCON1.SM2_1. If this bit

is cleared, the baud rate is the system

clock divided by 4. If the bit is set, the

system clock is divided by 12.

Data

transmission

begins

when

instruction writes to the SBUF0 (or SBUF1)

out, LSB first, at the selected baud rate.

Data reception starts when SCON0.REN_0

/ SCON1.REN_1 is set and the receive

interrupt flag SCON0.RI_0 / SCON1.RI_1

is cleared. The bit clock is activated and

the UART shifts data in on each rising

edge of the bit clock, until 8 bits have been

received. Immediately after the 8th bit is

shifted in, the receive interrupt flag is set

and reception stops until the software

clears the flag.

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