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1.3.3
Pin Functions
Table 1-3 outlines the pin functions of the H8S/2646.
Table 1-3
Pin Functions
Type
Symbol
Power
Vcc
PWMVcc
LPVcc
V1, V2, V3
Vss
PWMVss
VCL
Clock
PLLVss
PLLCAP
XTAL
EXTAL
OSC1
20
I/O
Name and Function
Input
Power supply: For connection to the power supply.
All Vcc pins should be connected to the system power
supply.
Input
PWM port power supply: Power supply pin for port H,
port J, and the motor control PWM timer output
Input
Port power supply: Power supply pin for ports A, B, C,
D, E, and part of port F (PF2 and PF4 to PF6)
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
Input
Ground: For connection to ground (0 V). All Vss pins
should be connected to the system power supply (0 V).
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)
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.
Input
PLL ground: Ground for on-chip PLL oscillator.
Input
PLL capacitance: External capacitance pin for on-chip
PLL oscillator.
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.
Input
Connects to a crystal oscillator.
See section 21, Clock Pulse Generator, for typical
connection diagrams for a crystal oscillator.
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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