SERIAL I/O
7751 Group User’s Manual
7–33
7.3 Clock synchronous serial I/O mode
7.3.7 Process on detecting overrun error
In the clock synchronous serial I/O mode, an overrun error can be detected.
An overrun error occurs when the next data is prepared in the UARTi receive register with the receive
complete flag = “1” (data is present in the UARTi receive buffer register) and that is transferred to the
receive buffer register, in other words, when the next data is prepared before reading out the contents of
the UARTi receive buffer register. When an overrun error occurs, the next receive data is written into the
UARTi receive buffer register, and the UARTi receive interrupt request bit is not changed.
An overrun error is detected when data is transferred from the UARTi receive register to the UARTi receive
buffer register and the overrun error flag is set to “1.” The overrun error flag is cleared to “0” by clearing
the receive enable bit to “0.”
When an overrun error occurs during reception, initialize the overrun error flag and the UARTi receive
buffer register before performing reception again. When it is necessary to perform retransmission owing to
an overrun error which occurs in the receiver side, set the UARTi transmit buffer register again before
starting transmission again.
The method of initializing the UARTi receive buffer register and that of setting the UARTi transmit buffer
register again are described below.
(1)
Method of initializing UARTi receive buffer register
➀
Clear the receive enable bit to “0” (reception disabled).
➁
Set the receive enable bit to “1” again (reception enabled).
(2)
Method of setting UARTi transmit buffer register again
➀
Clear the serial I/O mode select bits to “000
2
” (serial I/O ignored).
➁
Set the serial I/O mode select bits to “001
2
” again.
➂
Set the transmit enable bit to “1” (transmission enabled), and set the transmit data to the UARTi
transmit buffer register.
Содержание 7700 FAMILY
Страница 2: ...MITSUBISHI 16 BIT SINGLE CHIP MICROCOMPUTER 7700 FAMILY 7751 SERIES 7751 Group User s Manual...
Страница 11: ...Table of Contents viii 7751 Group User s Manual MEMORANDUM...
Страница 12: ...CHAPTER 1 DESCRIPTION 1 1 Performance overview 1 2 Pin configuration 1 3 Pin description 1 4 Block diagram...
Страница 48: ...CHAPTER 3 INPUT OUTPUT PINS 3 1 Programmable I O ports 3 2 I O pins of internal peripheral devices...
Страница 157: ...TIMER B 6 28 7751 Group User s Manual 6 5 Pulse period pulse width measurement mode MEMORANDUM...
Страница 245: ...7751 Group User s Manual 8 36 A D CONVERTER Precautions when using A D converter MEMORANDUM...
Страница 246: ...CHAPTER 9 WATCHDOG TIMER 9 1 Block description 9 2 Operation description 9 3 Precautions when using watchdog timer...
Страница 254: ...CHAPTER 10 STOP MODE 10 1 Clock generating circuit 10 2 Operation description 10 3 Precautions for Stop mode...
Страница 260: ...CHAPTER 11 WAIT MODE 11 1 Clock generating circuit 11 2 Operation description 11 3 Precautions for Wait mode...
Страница 265: ...7751 Group User s Manual WAIT MODE 11 6 11 3 Precautions for Wait mode MEMORANDUM...
Страница 289: ...CONNECTION WITH EXTERNAL DEVICES 12 4 Hold function 7751 Group User s Manual 12 24 MEMORANDUM...
Страница 290: ...CHAPTER 13 RESET 13 1 Hardware reset 13 2 Software reset...
Страница 302: ...CHAPTER 14 CLOCK GENERATING CIRCUIT 14 1 Oscillation circuit example 14 2 Clock...
Страница 307: ...CLOCK GENERATING CIRCUIT 7751 Group User s Manual 14 6 14 2 Clock MEMORANDUM...
Страница 359: ...ELECTRICAL CHARACTERISTICS 7751 Group User s Manual 15 52 MEMORANDUM 15 15 Testing circuit for ports P0 to P8 1 and E...
Страница 360: ...CHAPTER 16 STANDARD CHARACTERISTICS 16 1 Standard characteristics...
Страница 365: ...STANDARD CHARACTERISTICS 16 1 Standard characteristics 7751 Group User s Manual 16 6 MEMORANDUM...
Страница 366: ...CHAPTER 17 APPLICATIONS 17 1 Memory expansion...
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Страница 406: ...CHAPTER 18 PROM VERSION 18 1 EPROM mode 18 2 Usage precaution...
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Страница 418: ...CHAPTER 19 FLASH MEMORY VERSION 19 1 Parallel input output mode 19 2 Serial input output mode...
Страница 451: ...FLASH MEMORY VERSION 7751 Group User s Manual 19 34 19 2 Serial input output mode MEMORANDUM...
Страница 483: ...APPENDIX 7751 Group User s Manual 20 32 Appendix 4 Package outlines Appendix 4 Package outlines 80P6N A...
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Страница 489: ...APPENDIX 7751 Group User s Manual 20 38 Appendix 6 Hexadecimal instruction code table...
Страница 490: ...APPENDIX 7751 Group User s Manual 20 39 Appendix 6 Hexadecimal instruction code table...
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Страница 536: ...GLOSSARY...
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