Description

The HD404829R series incorporates an 8-bit A/D converter (four channels), a Liquid Crystal Display (LCD) and a serial interface, and has large-current Input/Output (I/O) pins. The series is a 4-bit single-chip microcomputer best used in the AV equipment such as CD radio cassette tape recorders which require the LCD display control.

Features

• 1,876-digit × 4-bit RAM

• 44 I/O pins, including 10 high-current pins (15 mA, max.) and 20 pins multiplexed with LCD segment pins

• Four timer/counters

• 8-bit input capture circuit

• Three timer outputs (including two PWM out-puts)

• Two event counter inputs (including one double-edge function)

• Clock-synchronous 8-bit serial interface

• A/D converter (4 channels × 8 bits)

• LCD controller/driver (52 segments × 4 commons)

• Built-in oscillators

― Main clock: 4.2-MHz ceramic (an external clock is also possible)

― Subclock: 32.768-kHz crystal

• Eleven interrupt sources

― Five by external sources, including three double-edge functions

― Six by internal sources

• Subroutine stack up to 16 levels, including interrupts

• Four low-power dissipation modes

― Subactive mode

― Standby mode

― Watch mode

― Stop mode

• One external input for transition from stop mode to active mode

• Instruction cycle time (min.): 0.95 µs (fOSC = 4.2 MHz)

• Operation voltage

VCC = 2.7 V to 6.0 V (HD404829R)

VCC = 2.7 V to 5.5 V (HD4074829)

• Two operating modes

― MCU mode

― MCU/PROM mode (HD4074829 only)