TMP89FS60 datasheet(241/410 Pages) TOSHIBA

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Page 227

TMP89FS60

RA001

16.12.3Overrun error

If receiving of all data bits is completed before the previous received data is read from RD0BUF, the overrun

error flag UART0SR<OERR> is set to "1" and an INTRXD0 interrupt request is generated. The data received

at the occurrence of the overrun error is discarded and the previous received data is maintained. Subsequently,

if data is received while UART0SR<OERR> is still "1", no INTRXD0 interrupt request is generated, and the

received data is discarded. (Figure 16-12)

Note that parity or framing errors in the discarded received data cannot be detected. (These error flags are not

set.) That is to say, if these errors are detected together with an overrun error during the reading of UART0SR,

they have occurred in the previous received data (the data stored in RD0BUF). (Figure 16-13)

If UART0SR<OERR> is "1" when UART0SR is read, UART0SR<OERR> will be cleared to "0" when

RD0BUF is read subsequently. (Figure 16-14)

If UART0SR<OERR> is set to "1" after UART0SR is read, UART0SR<OERR> will not be cleared to "0"

when RD0BUF is read subsequently. In this case, UART0SR<OERR> will be cleared to "0" when UART0SR

is read again and RD0BUF is read. (Figure 16-14)

Figure 16-12 Generation of INTRXD0 Interrupt Request

RXD0 pin input

Data A

An interrupt request

is generated.

The flag is set.

An interrupt request

is generated.

No interrupt

request is

generated.

Data B

INTRXD0 interrupt request

UART0SR<OERR>

UART0SR<RBFL>

Start Bit0

Bit1

Bit7

Stop Start Bit0

Bit1

Bit7

Stop

RD0BUF

Start Bit0

Bit1

Bit7

Stop

Data C

The contents of data B are discarded

and those of data A are maintained.

The contents of data C are discarded

and those of data A are maintained.

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