SH7670 Datasheet, PDF (954/1292 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

Section 22 Serial Communication Interface with FIFO (SCIF)
22.3.1 Receive Shift Register (SCRSR)
SCRSR receives serial data. Data input at the RxD pin is loaded into SCRSR in the order received,
LSB (bit 0) first, converting the data to parallel form. When one byte has been received, it is
automatically transferred to the receive FIFO data register (SCFRDR).
The CPU cannot read or write to SCRSR directly.
Bit: 7
6
5
4
3
2
1
0
Initial value: -
-
-
-
-
-
-
-
R/W: -
-
-
-
-
-
-
-
22.3.2 Receive FIFO Data Register (SCFRDR)
SCFRDR is a 16-byte FIFO register that stores serial receive data. The SCIF completes the
reception of one byte of serial data by moving the received data from the receive shift register
(SCRSR) into SCFRDR for storage. Continuous reception is possible until 16 bytes are stored.
The CPU can read but not write to SCFRDR. If data is read when there is no receive data in the
SCFRDR, the value is undefined.
When SCFRDR is full of receive data, subsequent serial data is lost.
SCFRDR is initialized to an undefined value by a power-on reset.
Bit: 7
6
5
4
3
2
1
0
Initial value: -
-
-
-
-
-
-
-
R/W: R
R
R
R
R
R
R
R
Rev. 1.00 Nov. 14, 2007 Page 928 of 1262
REJ09B0437-0100