Register 234H - I/O Port Location; I/O Range Select - Xycom AHIP6+ Manual

AHIP6+ Manual

Register 234h - I/O Port Location

Register 234h controls the I/O port location register shown in the following table.
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.
2-8
Table 2- 9. Register 234h - I/O Port Location Register
Bit Signal
0 Reserved
1 Reserved
2 Reserved
3 Reserved
4 I/O range select
5 I/O range select
6 I/O port bit 0
7 I/O port bit 1
Table 2- 10. I/O Range Selection
I/O range selection
00
01
10
11
Result
0
0
0
0
I/O range select bit 0
I/O range select bit 1
I/O port bit 0
I/O port bit 1
Range
no range
CC000-CFFFF
D0000-D7FFF
D8000-DFFFF
R/W
R
R
R
R
R
R
R/W
R/W