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12
12-37
Rev.1.0
SERIAL I/O
12.3 Transmit Operation in CSIO Mode
Figure 12.3.3 Example of CSIO Transmission (Transmitted Only Once, with Transmit Interrupt Used)
Note 1 : Change of the Interrupt Controller "SIO Transmit Interrupt Control Register" interrupt request
bit
Note 2 : When transmit interrupt is enabled (DMA transfer can also be requested at the same timing)
Note 3 : The Interrupt Controller IVECT register is read or "SIO Transmit Interrupt Control Register"
interrupt request bit cleared
Note 4 : Transmit interrupt request is generated when transmission is enabled.
Note 5 : Even after transmit data is written to the transmit buffer, a transmit interrupt request is
generated when the data is transferred from the transmit buffer to the transmit shift register
and the transmit buffer is thereby emptied.
12.3.8 Typical CSIO Transmit Operation
The following shows a typical transmit operation in CSIO mode.
: Processing by software
: Interrupt generation
Internal clock selected
External clock selected
<CSIO on receive side>
SCLKO
TXD
SCLKI
RXD
Transmit clock
(SCLKO)
Set
Write to
transmit
buffer register
Transmit buffer
empty bit
Transmit enable bit
Cleared
Transmit status bit
D7
D6
D5
D4
D3
D2
D1
D0
TXD
SIO transmit interrupt
(Note 1)
Transmit
interrupt
(Note 4)
Interrupt request accepted
Content of transmit buffer
register transferred to
transmit shift register
Cleared by
completion of
transmission
Set by a write to
transmit buffer
(Note 2)
(Note 3)
<CSIO on transmit side>
<CSIO on transmit side>
Transmit
interrupt
(Note 5)
Summary of Contents for 32172
Page 20: ... This is a blank page 16 ...
Page 21: ...1 1 Overview 1 2 Block Diagram 1 3 Pin Functions 1 4 Pin Layout CHAPTER 1 CHAPTER 1 OVERVIEW ...
Page 44: ...1 1 24 Rev 1 0 This is a blank page Overview 1 4 Pin Layout ...
Page 58: ...2 2 14 Rev 1 0 This is a blank page CPU 2 6 Data Formats ...
Page 122: ...4 4 26 Rev 1 0 This is a blank page EIT 4 13 Precautions on EIT ...
Page 200: ...7 7 6 Rev 1 0 This is a blank page RESET 7 4 Precautions to Be Taken Immediately after Reset ...
Page 298: ...9 9 58 Rev 1 0 This is a blank page DMAC 9 4 Precautions on Using DMAC ...
Page 776: ...19 19 10 Rev 1 0 RAM BACKUP MODE 19 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Page 782: ...20 20 6 Rev 1 0 OSCILLATION CIRCUIT 20 2 Clock Generator Circuit This is a blank page ...
Page 856: ...23 23 26 Rev 1 0 This is a blank page ELECTRICAL CHARACTERISTICS 23 6 AC Characteristics ...
Page 857: ...24 1 A D Conversion Characteristics CHAPTER 24 CHAPTER 24 STANDARD CHARACTERISTICS ...
Page 859: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Page 865: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...