Hitachi H8/300L Series Manual page 18

Application Perspectives
Application Example
This section describes the use of the H8/3724 Series in VCR units. The VFD controller/driver
directly drives the VCR front panel vacuum fluorescent display. The built-in timers, of which
there are five types, are used to generate the basic timing for system control and for the
clock/calendar function, remote control reception control, the frame synchronization counter,
the alarm, and other functions. The two-channel serial
communication interface (SCI) forms the interface with
servo ICs and the on screen display control (OSD) IC.
Finally, the A/D converter acquires analog data from
various sensors for the microcomputer. Since the
H8/3724 Series provides a large capacity on-chip
ROM (24 kbytes to 48 kbytes), in addition to these
powerful peripheral functions it is possible to
implement VCR system control, timers, and display
control with a single microcomputer chip.
VISS detection
Servo circuits
Video circuits
Audio circuits
Tape end,
Tape start,
Condensation,
Cassette switch,
Tracking,
Reel lock,
Cylinder lock,
Level meters
(L/R),
S curve
Mechanism
mode switch
<Notation>
Vacuum fluorescent display
VFD:
Video index search system
VISS:
On-screen display
OSD:
Video programming system
VPS:
Frame
synchronization
30/25 Hz
System control
block
Mechanism
protection
SCI
Servo circuit
control
I/O
Mechanism
mode control
I/O
Sensor
processing
A/D
I/O
Mechanism
mode
motor driver
MM
Mechanism
mode motor
Vacuum Fluorescent Display Controller/Driver
VFD
VFD controller/driver
H8/3724 Series
Timer control block
TV screen
Clock
display
Calendar Record timer
Remote control
VFD display
reception
Remaining
Key input
tape
Alarm
Tuning control
Tape loading
Alarm output
motor driver
LM
Tape loading
motor
18
VCRs
I/O
Key input
14-bit PWM
Tuner circuit
32-byte data
buffer SCI
OSD
controller
I/O VPS
controller
Remote control
receiver circuit