m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 286
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m37905
Manufacturer Part Number
m37905
Description
Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.M37905.pdf
(565 pages)
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Fig. 11.3.9 Processing after reception is completed
Reading of receive data (Note 2)
UART0 receive buffer register (Address 36
UART1 receive buffer register (Address 3E
UART2 receive buffer register (Address B6
Checking completion of reception
UART0 transmit/receive control register 1 (Address 35
UART1 transmit/receive control register 1 (Address 3D
UART2 transmit/receive control register 1 (Address B5
b7
Checking error
UART0 transmit/receive control register 1 (Address 35
UART1 transmit/receive control register 1 (Address 3D
UART2 transmit/receive control register 1 (Address B5
b7
Notes 1: When performing the processing after reception is completed, using an interrupt, be sure to
b7
Processing after reading out receive data
2: In the case of an external clock and the RTS function selected, the RTS
3: This figure shows the bits and registers required for the processing.
[When not using interrupts]
select a receive interrupt (UARTi receive interrupt mode select bit = “0.”)
“L” when the UARTi receive buffer register is read out. Accordingly, when performing reception
continuously, be sure to write the dummy data to the UARTi transmit buffer register before
reading out the UARTi receive buffer register.
See Figure 11.3.12 for the change of flag state and the occurrence timing of an interrupt request.
1
1
b0
b0
1
b0
1
Read out receive data.
Receive complete flag
Overrun error flag
0 : Reception not completed
1 : Reception completed
0 : No overrun error
1 : Overrun error detected
7905 Group User’s Manual Rev.1.0
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11.3 Clock synchronous serial I/O mode
[When using interrupts]
A UARTi receive interrupt request occurs
when reception is completed.
UARTi receive interrupt
i
output level becomes
SERIAL I/O
(Note 1)
11-31
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