
12
1.3.3
Pin Functions
Table 1-3 outlines the pin functions of the H8S/2214.
Table 1-3
Pin Functions
Type
Symbol
I/O
Name and Function
Power
VCC
Input
Power supply: For connection to the power supply. All V
CC
pins should be connected to the system power supply.
VSS
Input
Ground: For connection to ground (0 V). All V
SS pins should
be connected to the system power supply (0 V).
Clock
XTAL
Input
Crystal: Connects to a crystal oscillator. See section 16,
Clock Pulse Generator, for typical connection diagrams for
a crystal oscillator and external clock input.
EXTAL
Input
External clock: Connects to a crystal oscillator. The EXTAL
pin can also input an external clock. See section 16, Clock
Pulse Generator, for typical connection diagrams for a
crystal oscillator and external clock input.
Output System clock: Supplies the system clock to an external
device.
Operating mode
control
MD2 to
MD0
Input
Mode pins: These pins set the operating mode. The relation
between the settings of pins MD2 to MD0 and the operating
mode is shown below. These pins should not be changed
while the H8S/2214 is operating. Except when the mode is
changed, the mode pins (MD2 to MD0) must be pulled
down or pulled up to a fixed level until powering off.
MD2
MD1
MD0
Operating Mode
000—
1—
10—
1—
1
0
Mode 4
1
Mode 5
1
0
Mode 6
1
Mode 7
System control
RES
Input
Reset input: When this pin is driven low, the chip enters the
power-on reset state.
MRES
Input
Manual reset: When this pin is driven low, the chip enters
the manual reset state.