MC81F4x16
24.2 Modes and Procedures
Uart Mode 0
Write to Shift Register (UDAT)
Shift
RxD (Data Out)
TxD (Shift Clock)
D0
D1
D2
D3
D4
D5
D6
D7
UTIR
Clear URIF and set SDR
URIR
SDR
Shift
D0
D1
D2
D3
D4
D5
D6
D7
RxD (Data In)
TxD (Shift Clock)
1
2
3
4
5
6
7
8
Figure 24-2 Timing Diagram for Serial Port Mode 0 Operation
In mode 0, both input and output data are passed through the RxD (R14) pin and TxD (R15) pin
generates the clock. Data is transmitted or received in 8-bit units only. The LSB of the 8-bit value is
transmitted (or received) first.
Note that, only master mode is provided.
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October 19, 2009 Ver.1.35