PCA5007 datasheet(24/112 Pages) PHILIPS

24 / 112 page

1998 Oct 07

Philips Semiconductors

Product speciﬁcation

Pager baseband controller

PCA5007

Table 17 Description of the S0CON bits

Table 18 Selection of the serial port modes

6.9.4

UART DATA REGISTER (S0BUF)

The UART data register (S0BUF) contains the serial data to be transmitted or data which has just been received. Bit 0

is transmitted or received first.

Table 19 Data Shift Register (S0BUF, SFR address 99H)

6.9.5

BAUD RATES

The baud rate in Modes 1 and 2 depends on the value of the SMOD bit in SFR PCON and may be calculated as:

• If SMOD = 0, (which is the value on reset), the baud rate is 1⁄16fosc

• If SMOD = 1, the baud rate is 1⁄8fosc.

BIT

SYMBOL

FUNCTION

S0CON.7

SM0

this bit together with the SM1 bit, is used to select the serial port mode; see Table 18

S0CON.6

SM1

this bit together with the SM0 bit, is used to select the serial port mode; see Table 18

S0CON.5

−

SM2 is not available

S0CON.4

REN

this bit enables serial reception and is set by software to enable reception, and cleared by

software to disable reception

S0CON.3

TB8

this bit is the 9th data bit that will be transmitted in Mode 2; set or cleared by software as

desired

S0CON.2

RB8

in Mode 2, this bit is the 9th data bit received; in Mode 1 it is the stop bit that was received

S0CON.1

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.

S0CON.0

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 (for exception

see SM2); must be cleared by software.

SM0

SM1

MODE

DESCRIPTION

BAUD RATE

8-bit UART

⁄16fosc or 1⁄8fosc

9-bit UART

⁄16fosc or 1⁄8fosc

76543210

Baud rate

SMOD

-----------------

osc

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