26 User’s Manual U15331EJ4V1UD
CHAPTER 1 GENERAL
1.1 Features
• ROM and RAM capacities
Item Data Memory
Part Number
Program Memory
(ROM) Internal RAM LCD Display RAM
µ
PD789488 Mask ROM
µ
PD78F9488 Flash memory
32 KB 1024 bytes 28 × 4 bits
µ
PD789489 Mask ROM 1536 bytes
µ
PD78F9489 Flash memory
48 KB
• Minimum instruction execution time can be selected from high speed (0.4
µ
s: @5.0 MHz operation with main
system clock), low speed (1.6
µ
s: @5.0 MHz operation with main system clock), and ultra low speed (122
µ
s:
@32.768 kHz operation with subsystem clock)
• A circuit to multiply the subsystem clock by 4 is selectable (15.26
µ
s: @131 kHz operation: 32.768 kHz subsystem
clock × 4)
• I/O ports: 45 (N-ch open-drain: 4)
• Timer: 6 channels
• Serial interface: 2 channels
• 10-bit resolution A/D converter: 8 channels
• LCD controller/driver (on-chip voltage booster)
Segment signals: 28, common signals: 4
• On-chip multiplier: 8 bits × 8 bits = 16 bits
• On-chip infrared remote controller receiver (
µ
PD789489, 78F9489 only)
• On-chip key return signal detector
• Supply voltage: VDD = 1.8 to 5.5 V
1.2 Applications
CD radio-cassette players, portable audio, compact cameras, healthcare equipment, etc.