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UM10503
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User manual
Rev. 1.3 — 6 July 2012
1008 of 1269
NXP Semiconductors
UM10503
Chapter 39: LPC43xx SSP0/1
39.6.7 SSP Raw Interrupt Status Register
This read-only register contains a 1 for each interrupt condition that is asserted,
regardless of whether or not the interrupt is enabled in the SSPnIMSC.
39.6.8 SSP Masked Interrupt Status Register
This read-only register contains a 1 for each interrupt condition that is asserted and
enabled in the SSPnIMSC. When an SSP interrupt occurs, the interrupt service routine
should read this register to determine the cause(s) of the interrupt.
Table 878: SSP Interrupt Mask Set/Clear register (IMSC - address 0x4008 3014 (SSP0),
0x400C 5014 (SSP1)) bit description
Bit
Symbol
Description
Reset
value
0
RORIM
Software should set this bit to enable interrupt when a Receive Overrun
occurs, that is, when the Rx FIFO is full and another frame is completely
received. The ARM spec implies that the preceding frame data is
overwritten by the new frame data when this occurs.
0
1
RTIM
Software should set this bit to enable interrupt when a Receive Time-out
condition occurs. A Receive Time-out occurs when the Rx FIFO is not
empty, and no has not been read for a time-out period. The time-out
period is the same for master and slave modes and is determined by the
SSP bit rate: 32 bits at PCLK / (CPSDVSR
[SCR+1]).
0
2
RXIM
Software should set this bit to enable interrupt when the Rx FIFO is at
least half full.
0
3
TXIM
Software should set this bit to enable interrupt when the Tx FIFO is at
least half empty.
0
31:4
-
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA
Table 879: SSP Raw Interrupt Status register (RIS - address 0x4008 3018 (SSP0), RIS -
0x400C 5018 (SSP1)) bit description
Bit
Symbol
Description
Reset
value
0
RORRIS
This bit is 1 if another frame was completely received while the RxFIFO
was full. The ARM spec implies that the preceding frame data is
overwritten by the new frame data when this occurs.
0
1
RTRIS
This bit is 1 if the Rx FIFO is not empty, and has not been read for a
time-out period. The time-out period is the same for master and slave
modes and is determined by the SSP bit rate: 32 bits at PCLK /
(CPSDVSR
[SCR+1]).
0
2
RXRIS
This bit is 1 if the Rx FIFO is at least half full.
0
3
TXRIS
This bit is 1 if the Tx FIFO is at least half empty.
1
31:4
-
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA