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Connect Tech Blue Heat/Net Sync User Manual

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Interrupts

INT *

Usage

/INT1, /INT2

IUSC logically or-ed interrupts. IUSC Interrupts can be muxed to any of the two INTs.

One use is to mux all ports configured for Async mode to one IRQ and all ports

configured for Sync mode to another interrupt. This should facilitate better software

architecture and operation.

/INT3

PLD Interrupt. To support miscellaneous PLD section functions.

/INT6

Ethernet PHY Interrupt. Same PHY as other MCF5272 based Blue Heat/Net models.

* INTs are active low. Unused interrupts are pulled up to V+.

Table 6: Interrupts

ColdFire MCF5272 GPIO

GPIO Bit(s) *

Direction

Usage

PA0 – PA4,

PA6

Undefined

Undefined. For future expansion or debugging purposes. Available on

debug header P11 on page 8 of Schematic

PA5

Output

CPU Status LED.

1 = LED Off

0 = LED On.

PA8 – PA11

Input

PCB ID. Should be 0x4, for BHN Sync 4 Port.

PA13

Input

Pushbutton input.

1 = not pushed

0 = pushed

PA14

Output

Software forced hardware reset.

1 = Not reset. When setting up this GPIO, be sure to set port to a „1‟

before changing direction to output.

0 = forces a hardware reset

Table 7: ColdFire MCF5272 GPIO

* All unused GPIO is pulled up with a pullup resistor.

Base Address Map

Item

Address Range (hex)

ColdFire MBAR

1000 0000

Internal SRAM (4k Byte)

2000 0000

IUSC 0

4000 0000

IUSC 1

4000 0400

IUSC 2

4000 0800

IUSC 3

4000 0C00

PLD registers

4000 1000

DPR (32k Byte SRAM)

8000 0000

Flash (8 M Byte )

FE00 0000

Table 8: Base Address Map

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 75 76

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