Xycom AHIP-370, Manual

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Chapter Two - Installation
21
Register 234h - I/O Port Location
Register 234h controls the I/O port location register shown in the following table.
Table 2- 9. Register 234h - I/O Port Location Register
Bit Signal Result R/W
0 Reserved 0 R
1 Reserved 0 R
2 Reserved 0 R
3 Reserved 0 R
4 I/O range select I/O range select bit 0 R
5 I/O range select I/O range select bit 1 R
6 I/O port bit 0 I/O port bit 0 R/W
7 I/O port bit 1 I/O port bit 1 R/W
Bits 0-3 are reserved for the temperature sensor. Bits 4 and 5 are reserved for setting
the memory location for the SRAM.
I/O Range Select
The following are ranges defined by register 234h.
Table 2- 10. I/O Range Selection
I/O range selection Range
00 no range
01 CC000-CFFFF
10 D0000-D7FFF
11 D8000-DFFFF