描述 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.

特性 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)