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7721 Datasheet(PDF) 239 Page - Renesas Technology Corp

Part # 7721
Description  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  577 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7721 Datasheet(HTML) 239 Page - Renesas Technology Corp

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SERIAL I/O
7721 Group User’s Manual
11–36
11.4 Clock asynchronous serial I/O (UART) mode
Fig. 11.4.4 Writing data after start of transmission
[When not using interrupts]
[When using interrupts]
A UARTi transmit interrupt request occurs
when the UARTi transmit buffer register
becomes empty.
UARTi transmit interrupt
Note :
UART0 transmit buffer register (Addresses 3316, 3216)
UART1 transmit buffer register (Addresses 3B16, 3A16)
b7
b0
Writing of next transmit data
Set transmit data here.
b0
UART0 transmit/receive control register 1 (Address 3516)
UART1 transmit/receive control register 1 (Address 3D16)
b7
Transmit buffer empty flag
0: Data present in transmit buffer register
1: No data present in transmit buffer register
(Writing of next transmit data is possible.)
Checking state of UARTi transmit buffer register
1
This figure shows the bits and registers
required for processing.
Refer to “Figures 11.4.6 to 11.4.8” for the
change of flag state and the occurrence
timing of an interrupt request.
b0
b8
b15



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