UM10503
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User manual
Rev. 2.1 — 10 December 2015
1180 of 1441
NXP Semiconductors
UM10503
Chapter 42: LPC43xx/LPC43Sxx SSP0/1
42.6.9 SSP Interrupt Clear Register
Software can write one or more one(s) to this write-only register, to clear the
corresponding interrupt condition(s) in the SSP controller. Note that the other two interrupt
conditions can be cleared by writing or reading the appropriate FIFO, or disabled by
clearing the corresponding bit in SSPnIMSC.
42.6.10 SSP DMA Control Register
The SSPnDMACR register is the DMA control register. It is a read/write register.
Table 983: SSP Masked Interrupt Status register (MIS -address 0x4008 301C (SSP0),
0x400C 501C (SSP1)) bit description
Bit
Symbol
Description
Reset
value
0
RORMIS
This bit is 1 if another frame was completely received while the RxFIFO
was full, and this interrupt is enabled.
0
1
RTMIS
This bit is 1 if the Rx FIFO is not empty, has not been read for a
time-out period, and this interrupt is enabled. 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
RXMIS
This bit is 1 if the Rx FIFO is at least half full, and this interrupt is
enabled.
0
3
TXMIS
This bit is 1 if the Tx FIFO is at least half empty, and this interrupt is
enabled.
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 984: SSP interrupt Clear Register (ICR - address 0x4008 3020 (SSP0), ICR -
0x400C 5020 (SSP1)) bit description
Bit
Symbol
Description
Reset
value
0
RORIC
Writing a 1 to this bit clears the “frame was received when RxFIFO was
full” interrupt.
NA
1
RTIC
Writing a 1 to this bit clears the Rx FIFO was not empty and has not
been read for a time-out period interrupt. 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]).
NA
31:2
-
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
NA