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CHAPTER 17 SERIAL INTERFACE CHANNEL 1
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(3) MSB/LSB switching as the start bit
The 3-wire serial I/O mode enables to select transfer to start at MSB or LSB.
Figure 17-6 shows the configuration of the serial I/O shift register 1 (SIO1) and internal bus. As shown in the
figure, MSB/LSB can be read/written in inverted form.
MSB/LSB switching as the start bit can be specified with bit 6 (DIR) of the serial operating mode register 1 (CSIM1).
Figure 17-6. Circuit of Switching in Transfer Bit Order
Start bit switching is realized by switching the bit order for data write to SIO1. The SIO1 shift order remains
unchanged.
Thus, switch the MSB/LSB start bit before writing data to the shift register.
(4) Start of transfer
A serial transfer is started by setting transfer data in the serial I/O shift register 1 (SIO1) if the following two
conditions have been satisfied:
• The serial interface channel 1 operation control bit (CSIE1) = 1.
• After an 8-bit serial transfer, the internal serial clock is stopped or SCK1 is high.
Caution Setting CSIE1 to 1 after writing data in SIO1 does not initiate transfer operation.
When an 8-bit data transfer ends, serial transfer is stopped automatically and the interrupt request flag (CSIIF1)
is set.
7
6
Internal Bus
LSB Start
MSB Start
Read/Write Gate
Read/Write Gate
SI1
SO1
SCK1
D
Q
SO1 Latch
Shift Register 1 (SIO1)
1
0
Содержание 78014Y Series
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