SNC5A4_05 Datasheet, PDF (4/11 Pages) SONiX Technology Company – Two Channel Direct Drive Speech Controller

SNC5A4
Two Channel Direct Drive Speech Controller
5.6. I/O Ports
P1 is a 4-bit input port and P2/P3/P6 are three 4-bit I/O ports. Any bit of P2, P3 and
P6 can be programmed as either input or output port individually. Any valid data
transition (H L or L H) of P1, P2, P3 and P6 can reactivate the chip when the
chip is in power-down mode.
To Internal Data Bus
PAD
Read Control
Weak
Input Port Configuration (P10~P13)
Port Data
Port Status
PAD
Weak
To Internal Data Bus
Read Control
I/O Port Configuration (P20~P23, P30~P33, P60~P63)
Note: weak N-MOS’s can serve as pull-low resistors.
Ver: 1.4
4
June 8, 2005