m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 268
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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. 11.2.9 Contents of UARTi receive buffer register at reception completed
The UARTi receive register is used to convert serial data, which is input to the RxD
This register takes in the signal input to the RxD
The UARTi receive buffer register is used to read out receive data. When reception has been completed,
the receive data taken in the UARTi receive register is automatically transferred to the UARTi receive
buffer register. Note that the contents of the UARTi receive buffer register is updated when the next data
has been ready in the UARTi receive register before the data transferred to the UARTi receive buffer
register is read out. (i.e., an overrun error occurs.)
When “MSB first” is selected in the clock synchronous serial I/O mode, bit position of data in the UARTi
receive buffer register is reversed, and then the data of which bit position was reversed will be read out
as receive data. (Refer to section “11.3.2 Transfer data format.”) Receive operation itself is the same
whichever format is selected, “LSB first” or “MSB first.”
The UARTi receive buffer register is initialized by setting the receive enable bit (bit 2 at addresses 35
3D
Figure 11.2.9 shows the contents of the UARTi receive buffer register at reception completed.
16
and B5
16
UART mode
(Transfer data length : 9 bits)
Clock synchronous
serial I/O mode,
UART mode
(Transfer data length : 8 bits)
UART mode
(Transfer data length : 7 bits)
) to “1” after clearing it to “0.”
7905 Group User’s Manual Rev.1.0
High-order byte
(addresses 37
b7
0
0
0
0 0 0 0 0 0
0 0 0 0 0 0
0 0 0 0 0 0
Same value as bit
7 in low-order byte
Same value as bit
6 in low-order byte
i
pin, bit by bit, synchronously with the transfer clock.
16
, 3F
16
, B7
16
b0
)
b7
Low-order byte
(addresses 36
Receive data (9 bits)
Receive data (8 bits)
Receive data (7 bits)
11.2 Block description
16
, 3E
16
i
pin, into parallel data.
SERIAL I/O
, B6
b0
16
)
11-13
16
,
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