SZF2002 datasheet(35/76 Pages) PHILIPS

35 / 76 page

1998 Aug 26

Philips Semiconductors

Product speciﬁcation

Low voltage 8-bit microcontroller with

6-kbyte embedded RAM

SZF2002

17.2

Serial Port Control and Status Register (S0CON)

The Serial Port Control and Status Register is the Special Function Register S0CON. The register contains not only the

mode selection bits, but also the 9th data bit for transmit and receive (TB8 and RB8), and the serial port interrupt bits

(TI and RI).

Table 33 Serial Port Control Register (SFR address 98H)

Table 34 Description of S0CON bits

Table 35 Selection of the serial port modes

76543210

SMO

SM1

SM2

REN

TB8

RB8

BIT

SYMBOL

DESCRIPTION

SM0

Mode select. These 2 bits are used to select the serial port mode; see Table 35.

SM1

SM2

Enables the multiprocessor communication feature in Modes 2 and 3. In these modes, if

SM2 = 1, then RI will not be activated if the received 9th data bit (RB8) is a logic 0.

In Mode 1, if SM2 = 1, then RI will not be activated unless a valid stop bit was received.

In Mode 0, SM2 should be a logic 0.

REN

Enable serial reception. REN is set by software to enable reception, and cleared by

software to disable reception.

TB8

Is the 9th data bit that will be transmitted in Modes 2 and 3. Set or cleared by software

as desired.

RB8

In Modes 2 and 3, is the 9th data bit received. In Mode 1, if SM2 = 0, then RB8 is the

stop bit that was received. In Mode 0, RB8 is not used.

1TI

Transmit interrupt ﬂag. Set by hardware at the end of the 8th bit time in Mode 0, or at

the beginning of the stop bit time in the other modes, in any serial transmission. Must be

cleared by software.

0RI

Receive interrupt ﬂag. Set by hardware at the end of the 8th bit time in Mode 0, or

halfway through the stop bit time in the other modes, in any serial transmission (except

see SM2). Must be cleared by software.

SMO

SM1

MODE

DESCRIPTION

BAUD RATE

Mode 0

shift register

⁄6fclk

Mode 1

8-bit UART

variable

Mode 2

9-bit UART

⁄16fclk or 1⁄32fclk

Mode 3

9-bit UART

variable

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