The Talking Pen solution reads code printed on paper and plays the corresponding audio. Using the industry's smallest low-power RL78/G14 microcontroller, the ID decoder and image sensor reproduce sound files corresponding to the scanned content. Audio data can be saved from a PC to a Micro SD card with a USB cable. It uses the ISL80505 single output low dropout voltage regulator (LDO) capable of providing up to 500mA of output current from an input voltage of 1. 8V to 6V. Battery charge control is performed by the ISL6294 high input voltage charger.


  • Minimum instruction execution time: Can be changed from high speed (0.03125μs at 32MHz operation with high-speed on-chip oscillator) to ultra-low speed (30.5μs at 32.768kHz operation with subsystem clock)
  • General-purpose registers: (8-bit register × 8) × 4 banks
  • ROM: 128KB, RAM: 16KB, data flash: 8KB
  • Selectable high-speed on-chip oscillator clock: 64/48/32/24/16/12/8/6/4/3/2/1 MHz (TYP.)
  • On-chip debug function
  • On-chip selectable power-on-reset (POR) circuit
  • On-chip voltage detector (LVD)
  • On-chip watchdog timer (operable with the dedicated low-speed on-chip oscillator)
  • On-chip key interrupt function
  • On-chip clock output/buzzer output controller
  • On-chip BCD (binary-coded decimal) correction circuit
  • I/O port: 26
  • Timer
    • 16-bit timer: 8 channels
    • 12-bit interval timer: 1 channel
  • Serial interface
    • CSI: 3 channels
    • UART: 3 channels
    • Simplified I*C communication: 3 channels
    • Multi-master I*C communication: 1 channel
  • 8/10-bit resolution A/D converter: 8 channels
  • 8/10-bit resolution D/A converter: 1 channel
  • Comparator: 2 channels
  • Data transfer controller (DTC)
  • Event link controller (ELC)
  • Standby function: HALT mode or STOP mode or SNOOZE mode
  • Power supply voltage: VDD = 1.6V to 5.5V
  • Operating ambient temperature: TA = -40 °C to +85 °C

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
RL78/G14 Data Sheet Datasheet PDF 1.76 MB
ISL80505 Datasheet Datasheet PDF 1007 KB
ISL6294 Datasheet Datasheet PDF 518 KB
User Guides & Manuals
RL78/G14 User's Manual: Hardware 日本語 Manual PDF 10.83 MB
RL78/G14 Talking Pen 日本語 Sample Code ZIP 2.62 MB
Renesas RL78 Family Microcontrollers Brochure 日本語 Flyer PDF 5.89 MB