The µPD17068 is a 4-bit single-chip microcontroller for digital tuning systems. It contains an image display controller (IDC) that supports many types of display, and a PLL synthesizer. The CPU of the µPD17068 is capable of 4-bit parallel addition, logical operations, bit tests, setting/resetting of a carry flag, and supports a powerful interrupt function and timer function. The image display controller for on-screen display is user-programmable, allowing a range of displays to be programmed. The peripheral hardware includes a full complement of I/O ports, controlled with powerful I/O instructions, as well as a serial interface, a 6-bit A/D converter, and an 8-bit D/A converter (PWM output).

FEATURES
• Program memory (ROM) : 24K bytes (12032 × 16 bits)
• Character ROM (CROM) : 4086 × 24 bits (255 characters)
• Data memory (RAM) : 1007 × 4 bits
• Video RAM (VRAM) : 672 × 4 bits (can be used for data memory)
• Address stack : 12 levels
• Interrupt stack : 2 levels
• Instruction execution time : 2 µs (when an 8 MHz crystal is used)
• PLL frequency synthesizer
• 8-bit serial interface
(2 channels: One for two-wire or three-wire mode, compatible with I2C bus, and one for three-wire mode only)
• D/A converter: 8 bits × 9 lines (PWM output)
• A/D converter: 6 bits × 8 lines
• Horizontal synchronizing signal counter
• Commercial power supply frequency counter
• Power-failure detection circuit and power-on reset circuit
• Interrupt input for remote-controller signal (with noise canceler)
• User-programmable image display controller (IDC)
Displayed characters : Up to 192 per screen (more characters can be displayed when the use of the entire
screen is specified with a program)
Display mode : 16 × 16 dots in 15 lines × 24 columns
14 × 16 dots in 17 lines × 24 columns
Character patterns : 255
Character format : 16 × 16 dots or 14 × 16 dots
Colors : 15
Character sizes : 16 sizes for height (can be specified per line)
24 sizes for width (can be specified per character)
• Many I/O ports
I/O : 19 ports
Input only : 4 ports
Output only : 21 ports
• Operating supply voltage: 5 V ±10 %
• Low power dissipation by use of CMOS technology