Motorola PowerQUICC II MPC8280 Series Reference Manual page 1414

Interrupts from Port C
Table 41-8. Port D Dedicated Pin Assignment (PPARD = 1) (continued)
Pin
PDIRD = 1 (Output)
PD7
1
PD6 FCC1: TxD[4]
UTOPIA 16
1
PD5 FCC1: TxD[3]
UTOPIA 16
PD4 BRG8: BRGO
1
Not available on the MPC8270.
2
MPHY address pins 3 and 4 (master mode) can come from FCC2, depending on CMXUAR programming. (See
Section 16.4.1, "CMX UTOPIA Address Register (CMXUAR).")
3
MPHY address pins 0–4 (slave mode) can come from FCC2, depending on CMXUAR programming. (See
Section 16.4.1, "CMX UTOPIA Address Register (CMXUAR).")
4
Available only when the primary option for this function is not used.
41.6 Interrupts from Port C
The port C lines associated with CDx and CTSx have a mode of operation where the pin
can be internally connected to the SCC/FCC but can also generate interrupts. Port C still
detects changes on the CTS and CD pins and asserts the corresponding interrupt request,
but the SCC/FCC simultaneously uses CTS and/or CD to automatically control operation.
This lets the user fully implement protocols V.24, X.21, and X.21 bis (with the assistance
of other general-purpose I/O lines).
To configure a port C pin as a CTS or CD pin that connects to the SCC/FCC and generates
interrupts, these steps should be followed:
1. Write the corresponding PPARC bit with a 1 and PSORC bit with 0.
2. Write the corresponding PDIRC bit with a zero.
3. Set the SIEXR bit (in the interrupt controller) to determine which edges cause
interrupts.
41-20
Freescale Semiconductor, Inc.
PSORD = 0
Default
PDIRD = 0 (Input)
SMC1: SMSYN
TDM_D1:
4
L1TSYNC/GRANT
(secondary option)
MPC8280 PowerQUICC II Family Reference Manual
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Pin Function
PDIRD = 1 (Output)
Input
1,2
GND FCC1: TxAddr[3]
MPHY, master,
multiplexed polling
1
FCC2: TxAddr[4]
MPHY, master,
multiplexed polling
IDMA1: DACK
GND FCC3: RTS
PSORD = 1
PDIRD = 0 (Input, or Default
Inout if Specified) Input
1,3
FCC1: TxAddr[3] GND
MPHY, slave,
multiplexed polling
1,3
FCC1: TxClav2
MPHY, master, direct
polling
1
FCC2: TxAddr[1]
MPHY, slave,
multiplexed polling
4
IDMA1: DONE V
Inout
(secondary option)
4
SMC2: SMRXD GND
(secondary option)
MOTOROLA
DD