Datasheet

71M6511/71M6511H

Single-Phase Energy Meter IC

DATA SHEET

NOVEMBER 2010

A Maxim Integrated Products Brand

Serial Interface 1 Control Register (S1CON).

The function of the serial port depends on the setting of the Serial Port Control Register S1CON.

MSB LSB

SM21

REN1

TB81

RB81

TI1

RI1

Table 16: The S1CON register

Bit Symbol Function

S0CON.7 SM0 These two bits set the UART0 mode:

Mode

Description

SM0

SM1

0 N/A 0 0

1 8-bit UART 0 1

2 9-bit UART 1 0

3 9-bit UART 1 1

S0CON.6 SM1

S0CON.5 SM20 Enables the inter-processor communication feature.

S0CON.4 REN0 If set, enables serial reception. Cleared by software to disable reception.

S0CON.3 TB80 The 9

transmitted data bit in Modes 2 and 3. Set or cleared by the

MPU, depending on the function it performs (parity check, multiprocessor

communication etc.)

S0CON.2 RB80 In Modes 2 and 3 it is the 9

data bit received. In Mode 1, if SM20 is 0,

RB80 is the stop bit. In Mode 0 this bit is not used. Must be cleared by

software

S0CON.1 TI0 Transmit interrupt flag, set by hardware after completion of a serial

transfer. Must be cleared by software.

S0CON.0 RI0 Receive interrupt flag, set by hardware after completion of a serial

reception. Must be cleared by software

Table 17: The S0CON Bit Functions

Note: The speed in Mode 2 depends on the SMOD bit in the SFR PCON. See the PCON register description.