P80CL31 datasheet(21/68 Pages) PHILIPS

21 / 68 page

1997 Apr 15

Philips Semiconductors

Product speciﬁcation

Low voltage 8-bit microcontrollers with

UART

P80CL31; P80CL51

Table 5

Serial Port Control Register (address 98H)

Table 6

Description of S0CON bits

Table 7

Selection of the serial port modes

76543210

SM0

SM1

SM2

REN

TB8

RB8

BIT

SYMBOL

DESCRIPTION

SM0

These bits are used to select the serial port mode; see Table 7.

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

Enables serial reception and 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

The 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

The 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.

SM0

SM1

MODE

DESCRIPTION

BAUD RATE

Mode 0

Shift register

⁄12 × fosc

Mode 1

8-bit UART

variable

Mode 2

9-bit UART

⁄32 or 1⁄64 × fosc

Mode 3

9-bit UART

variable

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