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Rev. 1.00, 05/04, page 396 of 544
15.4 Operation
15.4.1 Host Interface Activation
The host interface is activated by setting one of bits LPC3E to LPC1E in HICR0 to 1 in single-
chip mode. When the host interface is activated, the related I/O ports (ports 37 to 30, ports 83 and
82) function as dedicated host interface input/output pins. In addition, setting the FGA20E, PMEE,
LSMIE, and LSCIE bits to 1 adds the related I/O ports (ports 81 and 80, ports B0 and B1) to the
host interface's input/output pins.
Use the following procedure to activate the host interface after a reset release.
1. Read the signal line status and confirm that the LPC module can be connected. Also check that
the LPC module is initialized internally.
2. When using channel 3, set LADR3 to determine the channel 3 I/O address and whether
bidirectional data registers are to be used.
3. Set the enable bit (LPC3E to LPC1E) for the channel to be used.
4. Set the enable bits (GA20E, PMEE, LSMIE, and LSCIE) for the additional functions to be
used.
5. Set the selection bits for other functions (SDWNE, IEDIR).
6. As a precaution, clear the interrupt flags (LRST, SDWN, ABRT, OBF). Read IDR or TWR15
to clear IBF.
7. Set interrupt enable bits (IBFIE3 to IBFIE1, ERRIE) as necessary.