tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 236
tmp89fm42
Manufacturer Part Number
tmp89fm42
Description
8 Bit Microcontroller
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMP89FM42.pdf
(408 pages)
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16.9 Data Sampling Method
16. Asynchronous Serial Interface (UART)
RA001
RT clock
RXD0 pin
Internal received
data
Shift register
and the data receiving is suspended. Subsequently, when a falling edge is detected in the input pulses to the RXD0
pin, RT clock counting restarts and the data receiving restarts with the start bit.
If "1" is detected in sampling of the start bit, for example, due to the influence of noise, RT clock counting stops
A falling edge
is detected
RT15 14 13 12 11 10 9
Noise
the next falling edge is detected
Counting is suspended until
the start bit is 1
Error because
8
7 6
Figure 16-8 Start Bit Sampling
A falling edge
is detected
15 14 13 12 11 10 9
Start Bit
Start Bit
Page 222
because the start bit is 0
Receiving continues
8
7
6
5
4
3
2
1 0 15 14 13 12 11 10 9
Bit 0
Bit 0
The received data is taken
into the shift register
8
7
TMP89FM42
6
5
Bit 0
4 3
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