Section 1 Overview
Rev. 3.00 Sep. 27, 2007 Page 11 of 758
REJ09B0243-0300
1.4 Pin
Functions
Table 1.2 summarizes the pin functions.
Table 1.2
Pin Functions
Classification Symbol I/O
Name
Function
Vcc
I
Power supply
Power supply pin
Connect all Vcc pins to the system.
There will be no operation if any pins
are open.
Vss I
Ground Ground
pin
Connect all Vss pins to the system
power supply (0V). There will be no
operation if any pins are open.
Power supply
V
CL
O
Power supply for
internal power-
down
External capacitance pins for internal
power-down power supply
Connect these pins to Vss via a 0.1
to 0.47
µ
F capacitor (placed close to
the pins).
PLLVss
I
PLL ground
Ground pin for the on-chip PLL
oscillator
EXTAL
I
External clock
Connected to a crystal resonator.
An external clock signal may also be
input to the EXTAL pin.
Clock
XTAL
O
Crystal
Connected to a crystal resonator.
MD1
I
Mode set
Sets the operating mode. Do not
change values on this pin during
operation.
Operating mode
control
FWE I
Flash
memory
write enable
Pin for flash memory
Flash memory can be protected
against programming or erasure
through this pin.
Содержание SH7124 R5F7124
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