SNC88040
24-Channel MIDI/Speech Controller
5.5. IR Function
When IR is enabled, a 38.5KHz square wave is gated with P27. The 38.5KHz IR
signal is present at the pin when P27 is set to “1”.
38.5KHZ
"1"
P AD
IR e n
P 27
5.6. I/O Ports
There are three 8-bit I/O ports P0, P1, and P2. Any I/O can be individually
programmed as either input or output. When I/O is set to input, any valid data
transition (H L or LH) of each I/O port can wake-up the chip from power-down
mode.
P ort Da ta
P AD
P ort S ta tus
We a k
To Inte rna l Da ta Bus
Re a d Control
I/O Port Configuration
Note: weak N-MOS’ can serve as pull-low resistors.
s
Ver: 1.5
7
Sep 08, 2006
SONIX [ SONIX TECHNOLOGY COMPANY ]
