SERIAL I/O
7751 Group User’s Manual
7–10
The UARTi transmit buffer register is used to set transmit data. Set the transmit data into the low-order
byte of this register when operating in the clock synchronous serial I/O mode or when a 7-bit or 8-bit length
of transfer data is selected in the UART mode. When a 9-bit length of transfer data is selected in the UART
mode, set the transmit data into the UARTi transmit buffer register as follows:
•Bit 8 of the transmit data into bit 0 of high-order byte of this register.
•Bits 7 to 0 of the transmit data into the low-order byte of this register.
The transmit data which is set in the UARTi transmit buffer register is transferred to the UARTi transmit
register when the transmission conditions are satisfied, and then it is output from the TxD
i
pin synchronously
with the transfer clock. The UARTi transmit buffer register becomes empty when the data which is set in
the UARTi transmit buffer register is transferred to the UARTi transmit register. Accordingly, the user can
set next transmit data.
When selecting the “MSB first” in the clock synchronous serial I/O mode, the data of which bit position was
reversed is written, as a transmit data, into the UARTi transmit buffer register. (Refer to section “7.3.2
Transfer data format.”) Transmission operation itself is the same whichever format is selected, “LSB first”
or “MSB first.”
When quitting the transmission which is in progress and setting the UARTi transmit buffer register again,
follow the procedure described bellow:
➀
Clear the serial I/O mode select bits (bits 2 to 0 at addresses 30
16
, 38
16
) to “000
2
” (Serial I/O disabled).
➁
Set the serial I/O mode select bits again.
➂
Set the transmit enable bit (bit 0 at addresses 35
16
, 3D
16
) to “1” (transmission enabled) and set transmit
data in the UARTi transmit buffer register.
7.2 Block description
Содержание 7700 FAMILY
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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...
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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...
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Страница 360: ...CHAPTER 16 STANDARD CHARACTERISTICS 16 1 Standard characteristics...
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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...
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Страница 536: ...GLOSSARY...
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