
V PeRiPheRaL MoDuLes 3 (inteRFaCe): GeneRaL-PuRPose seRiaL inteRFaCe (eFsio)
V-1-42
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s1C33L17 teChniCaL ManuaL
0x300B01–0x300B11: serial i/F Ch.x Receive Data Registers (peFsiFx_RXD)
name
address
Register name
Bit
Function
setting
init. R/W
Remarks
0x0 to 0xFF(0x7F)
RXDx7
RXDx6
RXDx5
RXDx4
RXDx3
RXDx2
RXDx1
RXDx0
D7
D6
D5
D4
D3
D2
D1
D0
Serial I/F Ch.x receive data
RXDx7(x6) = MSB
RXDx0 = LSB
X
R
7-bit asynchronous
mode does not use
RXDx7 (fixed at 0).
00300B01
|
00300B11
(B)
serial i/F Ch.x
receive data
register
(pEFSIFx_RXD)
note: The letter ‘x’ in bit names, etc., denotes a channel number from 0 to 1.
0x300B01
Serial I/F Ch.0 Receive Data Register (pEFSIF0_RXD)
0x300B11
Serial I/F Ch.1 Receive Data Register (pEFSIF1_RXD)
D[7:0]
RXDx[7:0]: serial i/F Ch.x Receive Data Bits
The data in the receive data buffer can be read from this register beginning with the oldest data first.
The received data enters the receive data buffer. The receive data buffer is a 4-byte FIFO and can re-
ceive data until it becomes full unless received data is not read out. When the buffer is full and also the
shift register contains received data, an overrun error will occur if the received data is not read until
the next data receiving begins. The receive buffer status flag RDBFx is provided to indicate that it is
necessary to read the receive data buffer. This flag is set to 1 when the receive data buffer contains one
or more received data, and is reset to 0 when the receive data buffer becomes empty by reading all the
received data.
When the receive data buffer has received the number of data specified with FIFOINTx[1:0] (one data
in standard mode), a cause of receive buffer full interrupt occurs.
In 7-bit asynchronous mode, 0 is stored in RXDx7.
The serial data input from the SINx pin is converted into parallel data beginning with the LSB, with the
high-level signals changed to 1s and the low-level signals changed to 0s. The resulting data is stored in
this buffer.
This register is a read-only register, so no data can be written to it. (Default: indeterminate)