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26.3.2.6.5 Transmission Request Registers (TXRQ[1-4])
These four registers reflect the state of the TXR flags of all configured message buffers. The flags are
evaluated for transmit buffers only. If the number of configured message buffers is less than 128, the
remaining TXR flags have no meaning.
Figure 26-166 through Figure 26-169 and Table 26-152 illustrate these registers.
Figure 26-166. Transmission Request Register 4 (TXRQ4) [offset_CC = 32Ch]
31 16
TXR[127:112]
R-0
15 0
TXR[111:96]
R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Figure 26-167. Transmission Request Register 3 (TXRQ3) [offset_CC = 328h]
31 16
TXR[95:80]
R-0
15 0
TXR[79:64]
R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Figure 26-168. Transmission Request Register 2 (TXRQ2) [offset_CC = 324h]
31 16
TXR[63:48]
R-0
15 0
TXR[47:32]
R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Figure 26-169. Transmission Request Register 1 (TXRQ1) [offset_CC = 320h]
31 16
TXR[31:16]
R-0
15 0
TXR[15:0]
R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 26-152. Transmission Request Registers (TXRQn) Field Description
Bit Field Value Description
127-0 TXR Transmission request.
0 The respective message buffer is not ready for transmission.
1 If the flag is set, the respective message buffer is ready for transmission. Respectively, transmission of
this message buffer is in progress. In single-shot mode the flags are reset after transmission has
completed.
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FlexRay Module SPNU563–May 2014
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