Download  Print this page

Pin Descriptions; M38813m4-xxxhp Pin Description - Acer 390 Series Service Manual

Notebook computer.
Hide thumbs

Advertisement

2.5.4

Pin Descriptions

The pin functions are listed in the table below.
Table 2-10

M38813M4-XXXHP Pin Description

Pin
Name
Vcc, Vss
Power supply
CNVss
CNVss
RESET
Reset input
.XIN
Clock input
XOUT
Clock output
P0
-P0
I/O port P0
0
7
P1
-P1
I/O port P1
0
7
P2
-P2
I/O port P2
O
7
P3c-P37
I/O port P3
P40-P47
I/O port P4
P5c-P53
I/O port P5 ,
P60-P61
I/O port P6
Ao,So,E/R
Input port
W R/W
DQo-DQ
Input port
7
Major Chips Description
Power supply inputs 2.7 to 5.5V to Vcc, and 0V to Vss.
Controls the operating mode of the chip. Normally connected to Vss or Vcc.
To enter the reset state, this pin must be kept "L" for more than 2 s (under
normal Vcc conditions). If the crystal or ceramic resonator requires more
time to stabilize, extend this "L" level time as appropriate.
Input and output signals to and from the internal clock generation circuit.
Connect a ceramic resonator or quartz crystal between the X
to set the oscillation frequency. If an external clock is used, connect the
clock source to the X
IN
An 8-bit CMOS l/O port. An l/O direction register allows each pin to be
individually programmed as either input or output. The input is CMOS/TTL
level, and output is CMOS 3 state / Nch open drain
An 8-bit CMOS l/O port with the same function as port P0. The input is
CMOS/TTL level, and output is CMOS 3 state
An 8-bit CMOS l/O port with the same function as port P0. The input is
CMOS/TTL level, and output is CMOS 3 state. P
which capable of handling large current drive.
An 8-bit CMOS l/O port with the same functions as port P0. The input is
CMOS level, and output is CMOS 3 state. This port is used as input of key
on wake up and comparator functions. Pull-up transistor can be controlled
by the program.
An 8-bit l/O port with the same functions as port P0. The input is CMOS TTL
level, and output of P4
P4
are also used as the control signal outputs to the master CPU by
5
selecting by the program.
An 4-bit CMOS l/O port with the same functions as port P0. The input is
CMOS level, and output is CMOS 3 state. The P5 also act as serial l/O
function pins by selecting by the program.
An 2-bit CMOS l/O port with the same functions as port P0. The input is
CMOS level, and output is CMOS 3 state. The P6
signal to the master CPU, and P6
selecting by the program.
The control bus which control the interface between master CPU. The input
is CMOS/TTL level, and output is CMOS 3 state.
An 8-bit Input port used to interface with the master CPU. The input TTL
level, and output is CMOS/TTL level, and output is CMOS 3 state.
Function
pin and leave the X
OUT
-P4
,P4
,P4
is Nch open drain. And The P4
0
3
6
7
, act as l/O pin of the Timer X by
1
and X
IN
pin open.
-P
is the LED driver port
24
27
4
also act as the control
0
pins
OUT
and
2-79

Advertisement

Table of Contents

   Related Manuals for Acer 390 Series

Comments to this Manuals

Symbols: 0
Latest comments: