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Section 16 Renesas Serial Peripheral Interface
Page 806 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
Bit Bit Name
Initial
Value R/W Description
5, 4 TXTRG[1:0] 00 R/W Transmit Buffer Data Triggering Number
Specifies the timing at which the transmit buffer
empty state is determined, that is when the SPTEF
flag in the status register is set. When the number of
bytes of data in the transmit buffer (SPTX) is equal to
or less than the specified triggering number, the
SPTEF flag is set to 1.
00: 7 bytes (1)*
01: 6 bytes (2)*
10: 4 bytes (4)*
11: 0 bytes (8)*
Note: The value in the parenthesis shows the
number of available bytes in the transmit buffer
(SPTX).
3 0 R Reserved
The write value should always be 0. Otherwise,
operation cannot be guaranteed.
2 to 0 RXTRG[2:0] 000 R/W Receive Buffer Data Triggering Number
Specifies the timing at which the receive buffer full
state is determined, that is when the SPRF flag in the
status register is set. When the number of bytes of
data in the receive buffer (SPRX) is equal to or
greater than the specified triggering number, the
SPRF flag is set to 1.
000: 1 byte (31)*
001: 2 bytes (30)*
010: 4 bytes (28)*
011: 8 bytes (24)*
100: 16 bytes (16)*
101: 24 bytes (8)*
110: 32 bytes (0)*
111: 5 bytes (27)*
Note: * The value in the parenthesis shows the
number of available bytes in the receive
buffer (SPRX).