Philips Semiconductors
Objective specification
Microcontrollers for digital auto-sync and
VST TV controller applications
1
1.1
FEATURES
General
2
PCE84C486; PCE84C487
GENERAL DESCRIPTION
•
CMOS 8-bit CPU (enhanced 8048 CPU) with 4 kbytes
system ROM and 128 bytes system RAM
•
One 8-bit timer/event counter (T1) and one 8-bit counter
(T3) triggered by external input
•
Three single level vectored interrupt sources: external
(INTN), counter/timer and I
2
C-bus
•
2 directly testable inputs T0 and T1
•
On-chip oscillator clock frequency: 1 to 10 MHz
•
On-chip Power-on-reset with low power detector
•
The PCE84C486 has eleven quasi-bidirectional I/O
lines, the PCE84C487 has twelve. The configuration of
each I/O line individually selected by mask option
•
Idle and Stop modes for reduced power consumption
•
Operating temperature:
−25
to +85
°C
•
Operating voltage: 4.5 to 5.5 V
•
Packages: SDIP32 for the PCE84C486; SDIP42 for the
PCE84C487.
1.2
Special
The PCE84C486 and PCE84C487 are low-cost
microcontrollers and have been designed for use with
auto-sync monitors, handling mode detection, digital
control and Voltage Synthesized Tuning (VST). These
microcontrollers have no on-chip OSD function.
The term PCE84C48X is used throughout this data sheet
to refer to both devices. Differences between the
PCE84C486 and the PCE84C487 are highlighted
throughout the document.
The PCE84C48X is a member of the 84CXXX CMOS
microcontroller family. The device uses the PCE84CXX
processor core and has 4 kbytes of ROM and 128 bytes of
RAM. I/O requirements are catered for with 11 general
purpose bidirectional I/O lines (the PCE84C487 has 12)
plus 12 function combined I/O lines (the PCE84C487 has
16). Nine PWM analog outputs (the PCE84C487 has 13)
are available for analog control purposes and also a two
channel 4-bit ADC. The device has an 8-bit counter (T3),
for use in pulse counting applications and also an 8-bit
timer/counter (T1) with programmable clock. A Watchdog
timer, a master-slave I
2
C-bus interface and 2 directly
testable lines are also available on-chip.
The block diagram of the PCE84C486 is shown in Fig.1;
the block diagram of the PCE84C487 is shown in Fig.2.
•
Master-slave I
2
C-bus interface
•
Four 6-bit Pulse Width Modulated outputs
•
Four 7-bit Pulse Width Modulated outputs
•
Four 8-bit Pulse Width Modulated outputs (PCE84C487
only)
•
One 14-bit Pulse Width Modulated output
•
Two 4-bit Analog-to-Digital Converter (ADC) channels
•
14 derivative I/O ports
•
Watchdog Timer.
3
ORDERING INFORMATION
PACKAGE
TYPE NUMBER
NAME
PCE84C486
PCE84C487
SDIP32
SDIP42
DESCRIPTION
plastic shrink dual in-line package; 32 leads (400 mil)
plastic shrink dual in-line package; 42 leads (600 mil)
VERSION
SOT232-1
SOT270-1
1996 Feb 21
3
Embedded System
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