Optional Serial I/O; Pci Bus - Brother 1240 Service Manual

1.3.6

Optional serial I/O

HL-1250
The interrupt of the serial I/O is input to the EXINT terminal of the ASIC, and is recognized by
the CPU. A 32-byte register is provided for this I/O, which is read from and written to by the
CPU.
1.3.7

PCI bus

HL-1270N
The interface of the PCI bus is PCI specification revision 2.2 compliant.
Fig. 3-16
Fig. 3-17
3-15
CHAPTER 3 THEORY OF OPERATION