I/O Expansion

0x30

0x47

Port A bit_0 output

Port A byte output

Port B byte output

Port C byte input

Port D byte I/O

Port D I/O dir.

Gen Purpose Cnt L

Gen Purpose Cnt H

0x40

Port A bit_1 output

Port A bit_7 output

Port B bit output

0x38

Port A, B bit outputs*:

Write to target control register with corresponding

bit location set to desired output.

Port A, B, C & D byte I/O*:

Memory mapped addresses.

Port D I/O direction is controlled by the polarity of

the second bit of address 0x44. 0 for input, 1 for output.

General Purpose Counter:

(See details in register description section.)

* All I/O accesses are unaffected by SATURN Advanced Power Management modes

0x46

0x41

..

0x44

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