CC1010-RTY1 datasheet(66/150 Pages) TI2

66 / 150 page

CC1010

SWRS047A

Page 66 of 146

16.7 Serial Port 0 and 1

Two serial ports, serial port 0 and 1, are

implemented. They are controlled through

the SCON0 and SCON1 control register.

The data is buffered in SBUF0 and SBUF1.

Serial port 0 may be used for general

purpose serial communication. Timer 1

may be used to generate different baud

rates. Serial port 1 is primarily for use with

an in-circuit-debugger, but can also be

used

for

general

purpose

serial

communication. A block diagram is shown

in Figure 16.

The general-I/O ports that map to the

same physical pins as the serial ports

must be configured in a certain way in

order to allow serial communication. This

is summarized in Table 22.

The mode is set in SCON0.SMx_0 /

SCON1.SMx_0

receive

data,

SCON0.REN_0

/ SCON1.REN_1 must be

enabled for the ports. Separate transmit

and receive interrupt flags are available in

SCON0.TI_0

/ RI_0 and SCON1.TI_1 /

RI_1

. Note that the baud rate also

depends on the Clock Mode selected (see

page 35).

SCON0/SCON1

Receive

Shift Register

SBUF0/SBUF1

(Receive)

SBUF0/SBUF1

(Transmit)

Interrupt

Request

RI_0/RI_1

TI_0/TI_1

Read SBUF

Write SBUF

TXD0/TXD1

Load SBUF

Mode 0

Transmit

RXD0/RXD1

Data Bus

Figure 16. Serial ports block diagram

UART0

UART1

P3.0

P3.1

P3DIR.0

P3DIR.1

P2.0

P2.1

P2DIR.0

P2DIR.1

Mode 0

Mode 1-3

Mode 0

Mode 1-3

Table 22. Configuration of general purpose I/O for UART0 and UART1

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