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Section 16 Renesas Serial Peripheral Interface
R01UH0134EJ0400 Rev. 4.00 Page 807 of 2108
Sep 24, 2014
SH7262 Group, SH7264 Group
16.3.15 Buffer Data Count Setting Register (SPBFDR)
SPBFDR indicates the number of data units stored in the transmit buffer (SPTX) and receive
buffer (SPRX). The upper eight bits indicate the number of transmit data units in SPTX and the
lower eight bits indicate the number of receive data units in SPRX.
15 14 13 12 11 10 9 8
Bit:
Initial value:
R/W:
00000000
RRRRRRRR
⎯⎯⎯⎯
T[3:0]
76543210
Bit:
Initial value:
R/W:
00000000
RRRRRRRR
⎯⎯
R[5:0]
Bit Bit Name
Initial
Value
R/W Description
15 to 12 All 0 R Reserved
The write value should always be 0. Otherwise,
operation cannot be guaranteed.
11 to 8 T[3:0] 0000 R/W Indicates the number of bytes of data to be
transmitted in SPTX.
B'0000 indicates that SPTX is empty.
B'1000 indicates that SPTX is full.
7, 6 All 0 R Reserved
The write value should always be 0. Otherwise,
operation cannot be guaranteed.
5 to 0 R[5:0] 000000 R/W Shows the number of bytes of received data in
SPTX.
B'000000 indicates that SPRX is empty.
B'100000 indicates that SPRX is full.