Acer Travelmate 7100 Service Guide

Major Chips Description2-432.5 Philips 87C552 System Management Controller
The 87C552 Single-Chip 8-Bit Microcontroller is manufactured in an advanced CMOS process and
is a derivative of the 80C51 microcontroller family. The 87C552 has the same instruction set as the
80C51.
The 87C552 contains a 8kx8 a volatile 256x8 read/write data memory, five 8-bit I/O ports, one 8-bit
input port, two 16-bit timer/event counters (identical to the timers of the 80C51), an additional 16-
bit timer coupled to capture and...

2-44Service Guide· Extended temperature ranges
· OTP package available
2.5.2 Block DiagramFigure 2-687C552 Block Diagram 

Major Chips Description2-452.5.3 Pin Diagram9
P4.2/CMSR2
8
P4.1/CMSR1
7
P4.0/CMSR0
6
EW#
5
PWM1#
4
PWM0#
3
STADC
2
VDD
1
P5.0/ADC0
68
P5.1/ADC1
67
P5.2/ADC2
66
P5.3/ADC3
65
P5.4/ADC4
64
P5.5/ADC5
63
P5.6/ADC6
62
P5.7/ADC7
61
AVDD60AVSS
59AVref+
58AVref–
57P0.0/AD0
56P0.1/AD1
55P0.2/AD2
54P0.3/AD3
53P0.4/AD4
52P0.5/AD5
51P0.6/AD6
50P0.7/AD7
49EA#/VPP
48ALE/PROG#
47PSEN#
46P2.7/A15
45P2.6/A14
44P2.5/A13
43
P2.4/A12
42
P2.3/A11
41
P2.2/A10
40
P2.1/A09
39
P2.0/A08
38
NC
37
VSS
36
VSS
35
XTAL1
34
XTAL2
33
NC...

2-46Service Guide2.5.4 Pin Descriptions
Table 2-587C552 Pin DescriptionsMnemonicPin No.TypeName And FunctionVDD2I
Digital Power Supply: +5V power supply pin during normal operation,
idle and power-down mode.STADC3I
Start ADC Operation: Input starting analog to digital conversion (ADC
operation can also be started by software).PWM0#4O
Pulse Width Modulation: Output 0.PWM1#5O
Pulse Width Modulation: Output 1EW#6I
Enable Watchdog Timer: Enable for T3 watchdog timer and disable
power-down...

Major Chips Description2-47Table 2-587C552 Pin DescriptionsMnemonicPin No.TypeName And FunctionP4.0-P4.77-14I/O
Port 4: 8-bit quasi-bidirectional I/O port. Alternate functions include:7-12O
CMSR0-CMSR5 (P4.0-P4.5): Timer T2 compare and set/reset outputs
on a match with timer T2. 13, 1413, 14O
CMT0, CMT1 (P4.6, P4.7): Timer T2 compare and toggle outputs on a
match with timer T2.P5.0-P5.768-62,I
Port 5: 8-bit input port.1
ADC0-ADC7 (P5.0-P5.7): Alternate function: Eight input channels to
ADC.RST15I/O...

2-48Service Guide2.6 NS87338VJG Super I/O Controller
The PC87338VJG is a single chip solution for most commonly used I/O peripherals in ISA, and
EISA based computers. It incorporates a Floppy Disk Controller(FDC), two full featured UARTs,
and an IEEE 1284 compatible parallel port Standard PC-AT address decoding for all the
peripherals and a set of configuration registers are also implemented in this highly integrated
member of the Super l/O family. Advanced power management features, mixed voltage...

Major Chips Description2-49· The Bidirectional Parallel Port:
· Enhanced Parallel Port(EPP) compatible
· Extended Capabilities Port(ECP) compatible, including level 2 support
· Bidirectional under either software or hardware control
· Compatible with ISA, and EISA, architectures
· Ability to multiplex FDC signals on parallel port pins allows use of an external Floppy Disk
Drive(FDD)
· Includes protection circuit to prevent damage to the parallel port when a connected printer
is powered up or is operated...

2-50Service Guide2.6.2 Block DiagramConfiguration
RegistersUART
(16550 or 16450)UART
+ IrDA/HP & Sharp IR
(16550 or 16450)General
Purpose
RegistersPower
Down LogicIEEEE1284
Parallel PortHifh Current DriverFloppy Disk
Controller with
Digital Data
Separator
(Enhabced 8477)I/O PortsControl
InterruptDataHandshakeFloppy
Drive
Interface
OSCInterrupt
and
DMAFloppy
Drive
Interface InterruptIR
Interface Serial
Interface Interrupt Serial
Interface Config.
Inputs
Figure 2-8NS87338VJG Block Diagram 

Major Chips Description2-512.6.3 Pin DiagramFigure 2-9NS87338VJG Pin Diagram 

2-52Service Guide2.6.4 Pin Description
Table 2-6NS87338VJG Pin DescriptionsPinNo.I/ODescriptionA15-A067, 64,
62-60,
29, 19-
28I
Address.  These address lines from the microprocessor determine
which internal register is accessed.  A0-A15 are dont cares during
DMA transfer./ACK83I
Parallel Port Acknowledge.  This input is pulsed low by the printer to
indicate that it has received the data from the parallel port.  This pin
has a nominal 25 KW pull-up resistor attached to it.ADRATE0,
ADRATE196,
46O
FDD...