ST & T UPSD3212C - Manual (Page 42)

uPSD3212A, uPSD3212C, uPSD3212CV
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PORT Type and Description
Figure 17. PORT Type and Description (Part 1)
AI07438
Symbol Circuit Description
In /
Out
RESET I
• Schmitt input with internal pull-up
CMOS compatible interface
NFC : 400ns
WR, RD,ALE,
PSEN O
Output only
XTAL1,
XTAL2
I
O
On-chip oscillator
On-chip feedback resistor
Stop in the power down mode
External clock input available
CMOS compatible interface
PORT0 I/O Bidirectional I/O port
Schmitt input
Address Output ( Push-Pull )
CMOS compatible interface
NFC
xon