Section 1 Overview
Rev. 3.00 Mar. 14, 2006 Page 10 of 804
REJ09B0104-0300
1.3.3 Pin
Functions
Table 1.2
Pin Functions
Pin
Number
Classifi-
cation
Abbreviation
H8SX/1527 H8SX/1525 I/O
Description
Power
supply
V
CC
22, 54, 68
22, 54, 68
Input
Power supply pins. Connect to the system
power supply.
V
CL
41
41
Input
Connect to VSS via a 0.1-uF capacitor
(place it close to this pin).
V
SS
20, 39, 52,
71
20, 39, 52,
71
Input
Ground pins. Connect to the system power
supply (0 V).
Clock
XTAL
69 69 Input
EXTAL 70 70 Input
Pins for a crystal resonator. External clock
can be input to the EXTAL pin. For a
connection example, see section 18, Clock
Pulse Generator.
B
φ
53
53
Output Supplies the system clock to external
devices.
Operating
mode
control
MD1
MD0
76
96
76
96
Input
Pins for setting the operating mode. The
signal levels of these pins must not be
changed during operation.
System
control
RES
66
66
Input
Reset signal input pin. This LSI enters the
reset state when this signal goes low.
EMLE
72
72
Input
Input pin for on-chip emulator enable
signal. Normally the signal level should be
fixed low.
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