MPC8280 datasheet(1336/1386 Pages) FREESCALE

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Parallel I/O Ports

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

41-20

Freescale Semiconductor

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.

PD8

FCC2: TxPrty 1

UTOPIA

SMC1: SMRXD

GND

BRG5: BRGO

PD7

SMC1: SMSYN

GND

FCC1: TxAddr[3]1,2

MPHY, master,

multiplexed polling

FCC2: TxAddr[4]1

MPHY, master,

multiplexed polling

FCC1: TxAddr[3]1,3

MPHY, slave,

multiplexed polling

FCC1: TxClav21,3

MPHY, master, direct

polling

FCC2: TxAddr[1]1

MPHY, slave,

multiplexed polling

GND

PD6

FCC1: TxD[4] 1

UTOPIA 16

IDMA1: DACK

PD5

FCC1: TxD[3] 1

UTOPIA 16

IDMA1: DONE4

Inout

(secondary option)

VDD

PD4

BRG8: BRGO

TDM_D1:

L1TSYNC/GRANT4

(secondary option)

GND

FCC3: RTS

SMC2: SMRXD4

(secondary option)

GND

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.

Table 41-8. Port D Dedicated Pin Assignment (PPARD = 1) (continued)

Pin Function

PSORD = 0

PSORD = 1

PDIRD = 1 (Output)

PDIRD = 0 (Input)

Defaul

t Input

PDIRD = 1 (Output)

PDIRD = 0 (Input, or

Inout if Specified)

Defaul

t Input

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