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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
Summary of Contents for 78014Y Series
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Page 62: ...www DataSheet4U com CHAPTER 2 OUTLINE PD78014Y Subseries 62 MEMO...
Page 78: ...www DataSheet4U com CHAPTER 3 PIN FUNCTION PD78014 Subseries 78 MEMO...
Page 94: ...www DataSheet4U com CHAPTER 4 PIN FUNCTION PD78014Y Subseries 94 MEMO...
Page 170: ...www DataSheet4U com CHAPTER 7 CLOCK GENERATOR 170 MEMO...
Page 222: ...www DataSheet4U com CHAPTER 9 8 BIT TIMER EVENT COUNTER 222 MEMO...
Page 230: ...www DataSheet4U com CHAPTER 10 WATCH TIMER 230 MEMO...
Page 262: ...www DataSheet4U com CHAPTER 14 A D CONVERTER 262 MEMO...
Page 318: ...www DataSheet4U com CHAPTER 15 SERIAL INTERFACE CHANNEL 0 PD78014 Subseries 318 MEMO...
Page 408: ...www DataSheet4U com CHAPTER 16 SERIAL INTERFACE CHANNEL 0 PD78014Y Subseries 408 MEMO...
Page 446: ...www DataSheet4U com CHAPTER 17 SERIAL INTERFACE CHANNEL 1 446 MEMO...
Page 472: ...www DataSheet4U com CHAPTER 18 INTERRUPT FUNCTIONS AND TEST FUNCTION 472 MEMO...
Page 502: ...www DataSheet4U com CHAPTER 22 PD78P014 78P014Y 502 MEMO...
Page 520: ...www DataSheet4U com CHAPTER 23 INSTRUCTION SET 520 MEMO...