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Connect Tech Blue Heat/Net Sync User Manual
Revision 0.03 49
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