W742S819 Datasheet, PDF (4/11 Pages) Winbond – 4-BIT TELEPHONE CONTROLLER

W742S819
4. PIN DESCRIPTION
SYMBOL
XIN
XOUT
VXXF
VF
RA0-RA3
RB0-RB3
RC0-RC3
RD0-RD3
RE0-RE3
RF0-RF3
MFP
DTMF
I/O
FUNCTION
I Input pin for 32.768 Hz oscillator. Connected to 32.768 KHz crystal only.
O
Output pin for 32.768 Hz oscillator. Connected to 32.768 KHz crystal
only.
I Regulator for PLL circuit. Connected capacitor (10 uF) to VSS.
I Low pass filter for PLL circuit. Connected capacitor 0.022uF to VSS.
Input/Output port.
I/O ^{Input/output mode specified by port mode 1 register (PM1).}
Internal pull-up resistors specified by RAM 7FEH(Refer to chapter 6.16.5)
Input/Output port.
I/O ^{Input/output mode specified by port mode 2 register (PM2).}
Internal pull-up resistors specified by RAM 7FFH (Refer chapter 6.16.5)
4-bit port for input only.
I
Each pin has an independent interrupt capability.
I/O
Input/Output port.
Input/output mode specified by port mode 5 register (PM5).
O Output port only. With high sink current capacity for the LED application.
O Output port only.
Output pin only.
O This pin can output modulating or nonmodulating frequency, or Timer 1
specified frequency. It can be selected by bit 0 of BUZCR (BUZCR.0).
O This pin can output dual-tone multi frequency signal for dialing.
RES
SEG0-SEG23
COM0-
COM7
OPP1~3
OPN1~3
OPO1~3
TEST
V_DD
V_SS
I System reset pin with low active.
O LCD segment output pins.
O
LCD common signal output pins.
The LCD alternating frequency can be selected by code option.
I OpAmp1~3 positive input pins
I OpAmp1~3 negative input pins
O OpAmp1~3 output pins
I For IC testing. Connected to Vss in normal usage.
I Positive power supply (+).
I Negative power supply (-).
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