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