Datasheet

17-4 MCF5407 User’s Manual
Overview
Address configuration
2
ADDR_CONFIG Programs parallel I/O ports I — User cfg 17-15
BE[3:0] configuration BE_CONFIG Programs byte enable pins I — User cfg 17-15
Divide control PCLK to
CLKIN
2
DIVIDE[2:0] Selects CLKIN/PCLK ratio I — User cfg 17-15
Section 17.6, “Chip-Select Module Signals”
17-15
Chip selects[7:0] CS[
7:0] Enables peripherals at programmed
addresses; CS0
provides boot ROM
selection.
O High 17-15
Byte enable[3:0]/
Byte write enable[3:0]
BE
[3:0]/
BWE
[3:0]
BE
[3:0] select bytes in memory.
Programmed at reset for CS0
O High 17-16
Output enable OE
Output enable for chip select read
cycles
O High 17-16
Section 17.7, “DRAM Controller Signals”
17-16
Row address strobe RAS
[1:0] DRAM row address strobe O High 17-16
Column address strobe CAS
[3:0] DRAM column address strobe O High 17-16
DRAM write DRAMW
Asserted for DRAM write; negated
for DRAM read
O High 17-16
Synchronous column
address strobe
SCAS
SDRAM column address strobe O High 17-17
Synchronous row
address strobe
SRAS
SDRAM row address strobe O High 17-17
Synchronous clock
enable
SCKE Clock enable for external SDRAM O Low 17-17
Synchronous edge
select
EDGESEL Timing select for external SDRAM I — User cfg 17-17
Section 17.8, “DMA Controller Module Signals”
17-17
DMA request DREQ
[1:0] External DMA transfer request;
multiplexed with PP[6:5]
I — 17-17
DMA acknowledge DACK[1:0] Indicates DMA transfer terminated;
multiplexed with TM[1:0]/PP[3:2]
O Parallel
port
17-18
Section 17.9, “Serial Module Signals”
17-18
Receive data RxD[1:0] Receive serial data input for UART I — 17-19
Transmit data TxD[1:0] Transmit serial data output for UART O High 17-18
Request-to-send R
TS[1:0] UART asserts when ready to
receive data query.
O High 17-19
Clear-to-send CTS
[1:0] Signals UART that data can be sent
to peripheral
I — 17-19
Section 17.10, “Timer Module Signals”
17-19
Timer input TIN[1:0] Clock input to timer or trigger to
timer value capture logic
I — 17-19
Table 17-1. MCF5407 Signal Index (Continued)
Signal Name Abbreviation Function I/O Reset Pull-Up Page