Buffer Data Count Setting Register (Spbfdr) - Renesas RZ/A Series User Manual

RZ/A1L Group, RZ/A1LU Group, RZ/A1LC 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.
Bit Bit Name
15 to 12 ―
11 to 8 T[3:0]
7, 6 ―
5 to 0 R[5:0]
R01UH0437EJ0600 Rev.6.00
Jan 29, 2021
Bit: 15 14 13
⎯ ⎯ ⎯
Initial value: 0 0 0
R/W: R R R
Bit: 7 6 5
⎯ ⎯
Initial value: 0 0 0
R/W: R R R
Initial Value R/W Function
All 0 R Reserved
The write value should always be 0. Otherwise, operation cannot be
guaranteed.
0000 R 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.
All 0 R Reserved
The write value should always be 0. Otherwise, operation cannot be
guaranteed.
000000 R Shows the number of bytes of received data in SPTX.
B'000000 indicates that SPRX is empty.
B'100000 indicates that SPRX is full.
16. Renesas Serial Peripheral Interface
12 11 10 9 8
⎯
T[3:0]
0 0 0 0 0
R R R R R
4 3 2 1 0
R[5:0]
0 0 0 0 0
R R R R R
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