Interrupts From Port C - Motorola MPC8260 PowerQUICC II User Manual

Table 35-8. Port D Dedicated Pin Assignment (PPARD = 1) (Continued)
Pin
PDIRD = 1 (Output)
PD8 FCC2: TxPrty
UTOPIA
PD7
PD6 FCC1: TxD[4]
UTOPIA 16
PD5 FCC1: TxD[3]
UTOPIA 16
PD4 BRG8: BRGO
1
MPHY address pins 3 and 4 (master mode) can come from FCC2, depending on CMXUAR programming. (See
Section 15.4.1, ÒCMX UTOPIA Address Register (CMXUAR).Ó)
2
MPHY address pins 0Ð4 (slave mode) can come from FCC2, depending on CMXUAR programming. (See
Section 15.4.1, ÒCMX UTOPIA Address Register (CMXUAR).Ó)
3
Available only when the primary option for this function is not used.

35.6 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 conÞgure 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.
MOTOROLA
Pin Function
PSORD = 0
Default
PDIRD = 0 (Input)
SMC1: SMRXD
SMC1: SMSYN
TDM_D1: L1TSYNC/
3
GRANT
(secondary option)
Chapter 35. Parallel I/O Ports
Part IV. Communications Processor Module
PDIRD = 1 (Output)
Input
GND BRG5: BRGO
1
GND FCC1: TxAddr[3]
MPHY, master,
multiplexed polling
FCC2: TxAddr[4]
MPHY, master,
multiplexed polling
IDMA1: DACK
GND FCC3: RTS
PSORD = 1
PDIRD = 0 (Input, or Default
Inout if SpeciÞed) Input
2
FCC1: TxAddr[3] GND
MPHY, slave,
multiplexed polling
2
FCC1: TxClav2
MPHY, master, direct
polling
FCC2: TxAddr[1]
MPHY, slave,
multiplexed polling
3
IDMA1: DONE
Inout
(secondary option)
3
SMC2: SMRXD GND
(secondary option)
35-19
V
DD