W921E880A/W921C880
4. Pin Description, continued
SYMBOL
I/O
DTMF
O
BTG
O
RESET
I
VDD
I
VSS
I
XT
I
XT
O
FUNCTION
Dual tone multi-frequency output pin.
Beep Tone Generator output pin.
Reset input pin with low active.
Positive power supply input pin.
Negative power supply input pin.
32.768 KHz subsystem clock input pin with internal cap.
32.768 KHz subsystem clock output pin.
Notes:
* open drain and pull high resistor option by software
> open drain option by software
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