i2cwrite portc.4, portc.3, %01000010, %00000111, [%00000000] ' SET U9 PORT 1 TO OUTPUTS
i2cwrite portc.4, portc.3, %01000010, %00000011, [acout] ' WRITE VARIABL ACout TO U9 PORT 1 LATCH REGISTER
insin = 0
i2cread portc.4, portc.3, %01000000,[insin]', noitwoc ' READ U8 PORT 0 AND 1 PIN STATES
i2cread portc.4, portc.3, %01000010, %00000000, [inson] ' READ U9 PORT 0 PIN STATES

Here are the write and read lines I've found to be successful with the MCP23016 I/O expander chip.

Use in good health.