User guide

2: Software Development for the ICP
DC 900-1338I 45
2.5.4 Programming the Test Mode Register
All modem control signals except Test Mode are handled directly by the IUSC associ-
ated with the port. The Test Mode input status for all supported ports is through the
Test Mode register located at 0x1808000 for the ICP2424 or 0x1810000 for the
ICP2432. When a bit is set to one, the Test Mode signal is asserted on the serial line. See
Figure 2–2 for the ICP2424 or Figure 2–3 for the ICP2432.
2.5.5 Programming the LED Register (ICP2424 only)
The byte-wide write-only LED register resides at address 0x410000. The LED register is
used to control the eight LEDs on the ICP2424 board’s edge. The LEDs are illuminated
when the register bit is 0 and off when the bit is 1.
2.6 ICP6000 Hardware Device Programming
In addition to the Motorola 68020 CPU, the ICP6000’s programmable devices include
the following:
Figure 2–2: Test Mode Register, ICP2424
Figure 2–3: Test Mode Register, ICP2432
Address = 0x1808000, byte wide, read only
0123Reserved
Address = 0x1810000, byte wide, read only
01237456