AT89C5132-ROTIL datasheet(117/181 Pages) ATMEL

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117

4173D–USB–02/06

AT89C5132

SCON (S:98h) – Serial Control Register

Reset Value = 0000 0000b

Table 92. SBUF Register

SBUF (S:99h) – Serial Buffer Register

Reset value = XXXX XXXXb

765

4321

FE/SM0

OVR/SM1

SM2

REN

TB8

RB8

Bit Number

Bit

Mnemonic

Description

Framing Error Bit

To select this function, set SMOD0 bit in PCON register.

Set by hardware to indicate an invalid stop bit.

Must be cleared by software.

SM0

Serial Port Mode Bit 0

Refer to Table 89 for mode selection.

6SM1

Serial Port Mode Bit 1

Refer to Table 89 for mode selection.

5SM2

Serial Port Mode Bit 2

Set to enable the multiprocessor communication and automatic address recognition

features.

Clear to disable the multiprocessor communication and automatic address recognition

features.

4REN

Receiver Enable Bit

Set to enable reception.

Clear to disable reception.

3TB8

Transmit Bit 8

Modes 0 and 1: Not used.

Modes 2 and 3: Software writes the ninth data bit to be transmitted to TB8.

2RB8

Receiver Bit 8

Mode 0: Not used.

Mode 1 (SM2 cleared): Set or cleared by hardware to reflect the stop bit received.

Modes 2 and 3 (SM2 set): Set or cleared by hardware to reflect the ninth bit received.

1TI

Transmit Interrupt Flag

Set by the transmitter after the last data bit is transmitted.

Must be cleared by software.

0RI

Receive Interrupt Flag

Set by the receiver after the stop bit of a frame has been received.

Must be cleared by software.

765

4321

SD7

SD6

SD5

SD4

SD3

SD2

SD1

SD0

Bit Number

Bit

Mnemonic

Description

7 - 0

SD7:0

Serial Data Byte

Read the last data received by the Serial I/O Port.

Write the data to be transmitted by the Serial I/O Port.

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