20
1.3.3 Pin Functions
Table 1-3 outlines the pin functions of the H8S/2646.
Table 1-3 Pin Functions
Type Symbol I/O Name and Function
Power Vcc Input Power supply: For connection to the power supply.
All Vcc pins should be connected to the system power
supply.
PWMVcc Input PWM port power supply: Power supply pin for port H,
port J, and the motor control PWM timer output
LPVcc Input Port power supply: Power supply pin for ports A, B, C,
D, E, and part of port F (PF2 and PF4 to PF6)
V1, V2, V3 Input LCD power supply: Power supply pin for LCD
controller/driver. There is an on-chip power supply
division resistor, so this pin is normally left open.
Power supply conditions: LPVcc ≥ V1 ≥ V2 ≥ V3 ≥ Vss
Vss Input Ground: For connection to ground (0 V). All Vss pins
should be connected to the system power supply (0 V).
PWMVss Input Ground: Power supply pin for port H, port J, and the
motor control PWM timer output. Connect all pins to
the system power supply (0 V)
VCL Input On-chip step-down power supply pin: Pin for
connecting the on-chip step-down power supply to a
capacitor for voltage stabilization. Connect to Vss via a
0.1 µF capacitor (which should be located near the
pin). Do not connect this pin to an external power
supply.
Clock PLLVss Input PLL ground: Ground for on-chip PLL oscillator.
PLLCAP Input PLL capacitance: External capacitance pin for on-chip
PLL oscillator.
XTAL Input Connects to a crystal oscillator.
See section 21, Clock Pulse Generator, for typical
connection diagrams for a crystal oscillator.
Use a crystal resonator for the system clock pulse
generator. External clock drive cannot be used.
EXTAL Input Connects to a crystal oscillator.
See section 21, Clock Pulse Generator, for typical
connection diagrams for a crystal oscillator.
OSC1 Input Subclock: Connects to a 32 kHz crystal oscillator.
See section 21, Clock Pulse Generator, for typical
connection diagrams for a crystal oscillator.
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