TABLE OF CONTENTS (Continued)
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USERS MANUAL
MOTOROLA
2.3.2
Chip Selects (CS[3:0])................................................................ 2-5
2.3.3
Byte Write Enables (A[27:24]/ CS[7:4]/ WE[0:3]) ....................... 2-5
2.4
Interrupt Control Signals ...................................................................... 2-7
2.4.1
Interrupt Priority Level/ Interrupt Request (IPL[2]/IRQ[7],IPL[1]/IRQ[4],
IPL[0]/IRQ[1]) .............................................................................. 2-7
2.5
Bus Control Signals.............................................................................. 2-8
2.5.1
Read/Write (R/W)....................................................................... 2-8
2.5.2
Size (SIZ[1:0]) ............................................................................ 2-8
2.5.3
Transfer Type (TT[1:0]) .............................................................. 2-9
2.5.4
Access Type and Mode (ATM)................................................... 2-9
2.5.5
Transfer Start (TS) ................................................................... 2-10
2.5.6
Transfer Acknowledge (TA) ..................................................... 2-10
2.5.7
Asynchronous Transfer Acknowledge (ATA) ........................... 2-10
2.5.8
Transfer Error Acknowledge (TEA) .......................................... 2-11
2.6
Bus Arbitration Signals....................................................................... 2-11
2.6.1
Bus Request (BR) .................................................................... 2-11
2.6.2
Bus Grant (BG) ........................................................................ 2-11
2.6.3
Bus Driven (BD) ....................................................................... 2-11
2.7
Clock and Reset Signals .................................................................... 2-12
2.7.1
Clock Input (CLK) ..................................................................... 2-12
2.7.2
Reset (RSTI) ............................................................................ 2-12
2.7.3
Reset Out (RTS[2]/RSTO) ....................................................... 2-12
2.8
DRAM Controller Signals ................................................................... 2-12
2.8.1
Row Address Strobes (RAS[1:0]) ............................................. 2-13
2.8.2
Column Address Strobes (CAS[3:0]) ....................................... 2-13
2.8.3
DRAM Write (DRAMW) ............................................................ 2-14
2.9
UART Module Signals ........................................................................ 2-14
2.9.1
Receive Data (RxD[1], RxD[2]) ................................................ 2-14
2.9.2
Transmit Data (TxD[1], TxD[2]) ................................................ 2-14
2.9.3
Request To Send (RTS[1], RTS[2]/RSTO) .............................. 2-15
2.9.4
Clear To Send (CTS[1], CTS[2]) .............................................. 2-15
2.10
Timer Module Signals ........................................................................ 2-15
2.10.1
Timer Input (TIN[2], TIN[1]) ...................................................... 2-15
2.10.2
Timer Output (TOUT[2], TOUT[1]) ........................................... 2-15
2.11
M-Bus Module Signals ....................................................................... 2-15
2.11.1
M-Bus Serial Clock (SCL) ........................................................ 2-15
2.11.2
M-Bus Serial Data (SDA) ......................................................... 2-15
2.12
General Purpose I/O Signals ............................................................. 2-16
2.12.1
General Purpose I/O (PP[7:4]/PST[3:0]) .................................. 2-16
2.12.2
Parallel Port (General-Purpose I/O) (PP[3:0]/DDATA[3:0]) ...... 2-16
2.13
Debug Support Signals ...................................................................... 2-16
2.13.1
Processor Status (PP[7:4]/PST[3:0]) ........................................ 2-16
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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