MCP23016
1.7.6
I/O EXPANDER CONTROL
REGISTER
• IOCON0 controls the functionality of the
MCP23016.
The IARES (Interrupt Activity Resolution) bit controls
the sampling frequency of the GP port pins. The higher
the sampling frequency, the higher the device current
requirements. If this bit is ‘0’ (default), the maximum
time to detect the activity on the port is 32 ms (max.),
which results in lower standby current. If this bit is ‘1’,
the maximum time to detect activity on the port is
200 µsec. (max.) and results in higher standby current.
REGISTER 1-11:
U-0
—
bit 7
bit 1-7
bit 0
IOCON0 - I/0 EXPANDER CONTROL REGISTER
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
R/W-0
IARES
bit 0
Unimplemented bit:
Read as ‘0’
IARES
:
Interrupt Activity Resolution
1 = Fast sample rate
0 = Normal sample rate
Legend:
R = Readable bit
- n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
IOCON1
is a shadow register for IOCON0. Access to IOCON1 results in access to IOCON0.
©
2007 Microchip Technology Inc.
DS20090C-page 11
MICROCHIP [ MICROCHIP TECHNOLOGY ]
