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7906 Datasheet(PDF) 283 Page - Renesas Technology Corp

Part # 7906
Description  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  531 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7906 Datasheet(HTML) 283 Page - Renesas Technology Corp

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SERIAL I/O
7906 Group User’s Manual Rev.2.0
11-42
11.4 Clock asynchronous serial I/O (UART) mode
[When not using interrupts]
[When using interrupts]
A UARTi transmit interrupt request occurs
when the transmission starts. (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
Transmit data is set.
b0
UART0 transmit/receive control register 1 (Address 3516)
UART1 transmit/receive control register 1 (Address 3D16)
b7
Transmit buffer empty flag
0: Data is present in transmit buffer register.
1: No data is 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.
See Figures 11.4.7 to 11.4.9 for the change
of flag state and the occurrence timing of an
interrupt request.
b0
b8
b15
Fig. 11.4.5 Write operation of data after transmission start



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