SH79F6489PSLASH080PR datasheet(100/152 Pages) SINOWEALTH

100 / 152 page

SH79F6488/SH79F6489

100

8.5.5 Error Detection

Error detection is available when the SSTAT bit in register PCON is set to logic 1.The SSTAT bit must be logic 1 to access any

of the status bits (FE, RXOV, and TXCOL). The SSTAT bit must be logic 0 to access the Mode Select bits (SM0, SM1, and

SM2).All the 3 bits should be cleared by software after they are set, even when the following frames received without any error

will not be cleared automatically.

Transmit Collision

The Transmit Collision bit (TXCOL bit in register SCON) reads ‘1’ if RI is set 0 and user software writes data to the SBUF

register while a transmission is still in progress. If this occurs, the new data will be ignored and the transmit buffer will not be

written.

Receive Overrun

The Receive Overrun bit (RXOV in register SCON) reads ‘1’ if a new data byte is latched into the receive buffer before software

has read the previous byte. The previous data is lost when this happen.

Frame Error

The Frame Error bit (FE in register SCON) reads ‘1’ if an invalid (low) STOP bit is detected.

Note: Before transmitting, TXD pin must be setted output high.

8.5.6 Registers

Table 8.20 Power Control Register

87H

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

PCON

SMOD

SSTAT

GF1

GF0

IDL

R/W

Reset Value

(POR/WDT/LVR/PIN)

Bit Number

Bit Mnemonic

Description

SMOD

Baud rate doubler

0: in Mode2, the baud-rate of EUART is 1/64 of the system clock

1: in Mode2, the baud-rate of EUART is 1/32 of the system clock

SSTAT

SCON[7:5] function select bit

0: SCON[7:5] operates as SM0, SM1, SM2

1: SCON[7:5] operates as FE, RXOV, TXCOL

3-2

GF[1:0]

General purpose flags for software use

Power-Down mode control bit

IDL

Idle mode control bit

SH79F6489P/080PR 데이터시트(PDF) 100 Page - SINOWEALTH Electronic Ltd

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