PSC Registers—MBAR + 0x2000, 0x2200, 0x2400, 0x2600, 0x2800, 0x2C00
MPC5200B Users Guide, Rev. 1
Freescale Semiconductor 15-19
15.2.10 Interrupt Status Register (0x14) ISR
The read-only ISR register provides status for all potential interrupt sources. Register contents is masked by the IMR.
If an ISR flag sets and the corresponding IMR bit is also set, the internal interrupt output is asserted.
If the corresponding IMR bit is cleared, the ISR bit state has no effect on the interrupt output.
6 IEC1 Interrupt enable control for D_DCD.
0 = D_DCD has no effect on the IPC in the ISR.
1 = When the D_DCD becomes high, IPC bit in the ISR sets (causing an interrupt if mask
is set).
7 IEC0 Interrupt enable control for D_CTS.
0 = D_CTS has no effect on the IPC in the ISR.
1 = When the D_CTS becomes high, IPC bit in the ISR sets (causing an interrupt if mask
is set).
After enable the PSC the D_CTS bit can be set, therefore it’s important to clear the D_CTS bit
before enable this interrupt.

Table15-26. Interrupt Status Register (0x14) for UART / SIR Mode

msb 012345678 9 101112131415 lsb
RIPC
Reserved
ORERR
TxEMP
DB
RxRDY
FFULL
TxRDY
Reserved
Error Reserved
W
RESET:000000000 0 0 000 0 0

Table15-27. Interrupt Status Register (0x14) other Modes

msb 012345678 9 101112131415 lsb
RIPC
Reserved
ORERR
URERR
Reserved
RxRDY
FFULL
TxRDY
DEOF
Error Reserved
CMD_SEND
DATA_OVR
DATA_VALID
UNEX_RX_
SLOT
W
RESET:000000000 0 0 000 0 0
Bit Name Description
0 IPC Input por t change interrupt.
0 = No IPC event was occurred.
1 = An IPC event was occurred.
1:2 — Reserved
3 ORERR Overrun Error
This bit is identical to the ORERR bit in the SR register. To clear this interrupt use the reset
error status command in the CR register.
Bit Name Description