Rev. 1.00, 09/03, page 9 of 704
1.3.3 Pin
Functions
Table 1.2
Pin Functions
Type
Symbol
Pin No.
I/O
Name and Function
VCC 16,
31,
83, 115
Input
Power supply pins. Connect all these pins to the
system power supply.
VCL
30
Input
External capacitance pin for internal step-down
power. Connect this pin to Vss through an
external capacitor (that is located near this pin)
to stabilize internal step-down.
Power
supply
VSS 13,
29,
34, 53,
86, 118
Input
Ground pins. Connect all these pins to the
system power supply (0V).
Clock XTAL 33 Input
EXTAL
32
Input
For connection to a crystal resonator. An
external clock can be supplied from the EXTAL
pin. For an example of crystal resonator
connection, see section 21, Clock Pulse
Generator.
φ
21
Output Supplies the system clock to external devices.
Operating
mode control
MD2
MD1
MD0
25
24
23
Input
These pins set the operating mode. Inputs at
these pins should not be changed during
operation.
System
control
RES
28
Input
Reset pin. When this pin is low, the chip is reset.
STBY
37
Input
When this pin is low, a transition is made to
hardware standby mode.
FWE
26
Input
Pin for use by flash memory.
Address bus A15 to A8
A7 to A0
107 to 114,
116, 117,
119 to 124
Output Address output pins
Data bus
D15 to D8
D7 to D0
125 to 4
5 to 12
I/O
Bidirectional data bus
AD15 to AD8 107 to 114 I/O
Upper 8-bit, 16-bit bus
Address/
data
multiplex
bus
AD7 to AD0
116, 117,
119 to 124
I/O Lower
16-bit
bus
Summary of Contents for H8S/2437
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