Rev. 1.0, 09/02, page 4 of 568
1.4 Pin
Functions
Type Symbol
Pin
NO.
I/O Function
Power
Supply
VCC 2
32
61
Input
Power supply pins. Connect all these pins to the
system power supply.
VSS
4
34
56
64
Input
Ground pins. Connect all these pins to the system
power supply (0 V).
VCL
58
Output
External capacitance pin for internal power-down
power supply. Connect this pin to VSS via a 0.1-
µF capacitor (placed close to the pins).
Clock
PLLVSS
65
Input
On-chip PLL oscillator ground pin.
PLLCAP
67
Output
External capacitance pin for an on-chip PLL
oscillator.
XTAL
62
Input
For connection to a crystal resonator. For
examples of crystal resonator connection and
external clock input, see section 20, Clock Pulse
Generator.
EXTAL
63
Input
For connection to a crystal resonator. (An
external clock can be supplied from the EXTAL
pin.) For examples of crystal resonator
connection and external clock input, see section
20, Clock Pulse Generator.
φ
68
Output
Supplies the system clock to external devices.
Operating
mode
control
MD2
MD1
MD0
55
54
53
Input
Set the operating mode. Inputs at these pins
should not be changed during operation.
System
control
RES
57
Input
Reset input pin. When this pin is low, the chip is
reset.
STBY
59
Input
When this pin is low, a transition is made to
hardware standby mode.
FWE
66
Input
Pin for use by flash memory. This pin is only used
in the flash memory version.
Содержание H8S/2627
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