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3823 Datasheet(PDF) 5 Page - Renesas Technology Corp

Part No. 3823
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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Maker  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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 5 page
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Rev.2.02
Jun 19, 2007
page 5 of 73
REJ03B0146-0202
3823 Group
PIN DESCRIPTION
Table 2 Pin description (1)
VCC, VSS
Function
Pin
Name
Function except a port function
•LCD segment output pins
Power source
•Apply voltage of power source to VCC, and 0 V to VSS. (For the limits of VCC, refer to “Recom-
mended operating conditions”).
VREF
AVSS
RESET
XIN
XOUT
VL1–VL3
COM0–COM3
SEG0–SEG11
P00/SEG16
P07/SEG23
P10/SEG24
P17/SEG31
P20/KW0
P27/KW7
P34/SEG12
P37/SEG15
Analog refer-
ence voltage
Analog power
source
Reset input
Clock input
Clock output
LCD power
source
Common output
Segment output
I/O port P0
I/O port P1
I/O port P2
•Reference voltage input pin for A/D converter.
•GND input pin for A/D converter.
•Connect to VSS.
•Reset input pin for active “L”.
•Input and output pins for the main clock generating circuit.
•Feedback resistor is built in between XIN pin and XOUT pin.
•Connect a ceramic resonator or a quartz-crystal oscillator between the XIN and XOUT pins to set
the oscillation frequency.
•If an external clock is used, connect the clock source to the XIN pin and leave the XOUT pin open.
•This clock is used as the oscillating source of system clock.
•Input 0 ≤ VL1 ≤ VL2 ≤ VL3 voltage.
•Input 0 – VL3 voltage to LCD.
•LCD common output pins.
•COM2 and COM3 are not used at 1/2 duty ratio.
•COM3 is not used at 1/3 duty ratio.
•LCD segment output pins.
•8-bit I/O port.
•CMOS compatible input level.
•CMOS 3-state output structure.
•I/O direction register allows each port to be individually
programmed as either input or output.
•Pull-down control is enabled.
•8-bit I/O port.
•CMOS compatible input level.
•CMOS 3-state output structure.
•I/O direction register allows each pin to be individually
programmed as either input or output.
•Pull-up control is enabled.
•4-bit input port.
•CMOS compatible input level.
•Pull-down control is enabled.
•Key input (key-on wake-up) interrupt
input pins
•LCD segment output pins
Input port P3




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