Renesas PCA4738L-64A Technical Information PDF herunterladen (Seite 7)

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

3825 Group

PIN DESCRIPTION

Table 1. Pin description (1)

Function

•Apply voltage of power source to V

CC, and 0 V to VSS. (For the limits of VCC, refer to “Recom-

mended operating conditions”.)

• 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 X

IN 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 ≤ V

L1 ≤ VL2 ≤ VL3 ≤ VCC voltage

• Input 0 – VL3 voltage to LCD

• External capacitor pins for a voltage multiplier (3 times) of LCD contorl.

• LCD common output pins

• COM

2 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 output port