TMP92CF30
2009-06-12
92CF30-297
2. Parity error <PERR>
The parity generated for the data shifted into receiving buffer 2 (SC0BUF) is
compared with the parity bit received via the RXD pin. If they are not equal, a
parity error is generated.
Note: The parity error flag is cleared every time it is read. However, if a parity error is detected w¥twice in succession
and the parity error flag is read between the two parity errors, it may seem as if the flag had not been cleared.
To avoid this situation, a read of the parity error flag should be riggered by a receive interrupt.
3. Framing
error
<FERR>
The stop bit for the received data is sampled three times around the center. If
the majority of the samples are “0”, a Framing error is generated.
(13) Timing generation
a. In UART Mode
Receiving
Mode
9-Bit
(Note)
8-Bit
+
Parity
(Note)
8-Bit, 7-Bit + Parity, 7-Bit
Interrupt timing
Center of last bit
(bit 8)
Center of last bit
(parity bit)
Center of stop bit
Framing error timing
Center of stop bit
Center of stop bit
Center of stop bit
Parity error timing
―
Center of last bit
(parity bit)
Center of stop bit
Overrun error timing
Center of last bit
(bit 8)
Center of last bit
(parity bit)
Center of stop bit
Note: In 9-Bit and 8-Bit + Parity Modes, interrupts coincide with the ninth bit pulse.
Thus, when servicing the interrupt, it is necessary to wait for a 1-bit period (to allow the stop bit to be
transferred) to allow checking for a framing error.
Transmitting
Mode
9-Bit
8-Bit + Parity
8-Bit, 7-Bit + Parity, 7-Bit
Interrupt timing
Just before stop bit is
transmitted
Just before stop bit is
transmitted
Just before stop bit is
transmitted
b. I/O
interface
SCLK Output Mode
Immediately after last bit. (See Figure 3.14.20.)
Transmission
Interrupt
timing
SCLK
Input
Mode
Immediately after rise of last SCLK signal Rising Mode, or
immediately after fall in Falling Mode. (See Figure 3.14.21.)
SCLK Output Mode
Timing used to transfer received to data Receive Buffer 2 (SC0BUF)
(i.e. immediately after last SCLK). (See Figure 3.14.22.)
Receiving
Interrupt
timing
SCLK Input Mode
Timing used to transfer received data to Receive Buffer 2 (SC0BUF)
(i.e. immediately after last SCLK). (See Figure 3.14.23.)
Содержание TLCS-900/H1 Series
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