Microcontroller User's Manual

26-4 MCF5282 User’s Manual MOTOROLA
External Signal Description
26.2 External Signal Description
The MCF5282 ports control the functionality of several external pins. These pins are listed
in Table 26-1.
Table 26-1. MCF5282 Ports External Signals
Primary
Function (Pin
Name)
1
GPIO
(Default
Function)
Alternate
Function 1
Alternate
Function 2
Description
D[31:0]
2
PA, PB, PC,
PD
— — External data bus / Ports A, B, C, D
OE
1
PE[7] — — Output enable for external reads / Port E[7]
TA
1
PE[6] — — Transfer acknowledge for external data transfer / Port E[6]
TEA
1
PE[5] — — Transfer error acknowledge for external data transfer / Port E[5]
R/W
1
PE[4] — — Read/Write indication for external data transfer / Port E[4]
SIZ1
1
PE[3] SYNCA — Size of the external data transfer / Port E[3] / Timer A sync
SIZ0
1
PE[2] SYNCB — Size of the external data transfer / Port E[3:2] / Timer B sync
TS
1
PE[1] SYNCA — Transfer start indication for external data transfer / Port E[1] / Timer A
sync
TIP
1
PE[0] SYNCB — Transfer in progress indication for external data transfer / Port E[0] /
Timer B sync
A[23:21]
1
PF[7:5] CS[6:4] — External address bus [23:21] / Port F[7:5] / Chip selects 6–4
A[20:0]
1
PF[4:0], PG,
PH
— — External address bus [20:0] / Ports F[4:0], G, H
BS[3:0]
1
PJ[7:4] — — Byte strobes for external data transfer / Port J[7:4] / SDRAM column
address strobes
CS[3:0]
1
PJ[3:0] — — Chip selects 3 - 0 / Port J[3:0]
DDATA[3:0] PDD[7:4] — — Debug data / Port DD[7:4]
PST[3:0] PDD[7:4] — — Processor status / Port DD[3:0]
ETXCLK PEH[7] — — Ethernet transmit clock / PEH[7]
ETXEN PEH[6] — — Ethernet transmit enable / PEH[6]
ETXD[0] PEH[5] — — Ethernet transmit data [0] / PEH[5]
ECOL PEH[4] — — Ethernet collision / PEH[4]
ERXCLK PEH[3] — — Ethernet receive clock / PEH[3]
ERXDV PEH[2] — — Ethernet receive data valid / PEH[2]
ERXD[0] PEH[1] — — Ethernet receive data [0] / PEH[1]
ECRS PEH[0] — — Ethernet carrier receive sense / PEH[0]
ETXD[3:1] PEL[7:5] — — Ethernet transmit data / Port EL[7:5]
ETXER PEL[4] — — Ethernet transmit error / Port EL[4]
ERXD[3:1] PEL[3:1] — — Ethernet receive data [3:1] / Port EL[3:1]