Overview
Description
The Talking Pen (reading pen) reference design 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.
Features
- 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, STOP mode, or SNOOZE mode
- Power supply voltage: VDD = 1.6V to 5.5V
- Operating ambient temperature: TA = -40°C to +85°C
Applications
Design & Development
Support
Support Communities
Resources
Videos & Training
In this Quick Solution, the ultra-low power RL78/G14 microcontroller efficiently assists the ID decoder and image sensor in reproducing sound files corresponding to the scanned contents. Sound data can be stored on a micro SD card via a USB cable.