■ DESCRIPTION

The MB89550A series is a general-purpose, single-chip microcontroller that features a compact instruction set and contains a range of peripheral functions including a dual- clock control system, 5-level operating speed control, LCD controller driver, A/D converter, D/A converter, timer, serial interface, PWM timer, PWC timer, and external interrupts. The LCD controller driver is particularly suited for simultaneous control of LCD duty drive and static drive functions.

■ FEATURES

• Range of package options

• LQFP package (0.5 mm pitch)

• TQFP package (0.4 mm pitch)

• High speed operation at low voltage

• Minimum instruction execution time 0.32 µs (for 12.5 MHz oscillation)

• F2MCR-8L CPU core

Instruction set optimized for controller applications

• Multiplication and division instructions

• 16-bit arithmetic operations

• Bit test branch instructions

• Bit manipulation instructions, etc.

• Dual-clock control system

• Main clock 12.5 MHz maximum : (Four speed settings available, oscillation halts in sub-clock mode)

• Sub-clock 32.768 kHz : (Operation clock for sub-clock mode)

• 11 timer systems

• 8/16-bit timer counter 1 (square wave output, 2-channel output switching available)

• 8/16-bit timer counter 2 (square wave output, 2-channel output switching available)

• 16-bit timer counter (also functions as event counter)

• 8-bit PWM timer (8-bit PWM timer × 2 channels or PPG timer × 1 channel, includes event counter function)

• 8-bit PWC timer (8-bit PWC timer × 1 channel)

• 6-bit PPG timer (6-bit PPG timer × 1 channel)

• 21-bit timebase timer

• Clock prescaler (17-bit)

• UART/serial interface

• UART/SIO switching

• UART

• Clock synchronous/asynchronous switching available

• 10-bit A/D converter

• 10-bit A/D × 8 channels

• 8-bit D/A converter

• 8-bit D/A × 2 channels

• External interrupts

• Eight independent inputs can be used for recovery from low-power consumption modes (selection of rising, falling, or both edge detection functions).

• Eight independent inputs can be used for recovery from low-power consumption modes (L level detection function included).

• Clock output functions

• High speed clock signal multiplied by 2 available as output from HCLK pin.

• Low speed clock pulse output available from LCLK pin.

• LCD controller driver

• 32SEG × 4COM (maximum 128 pixels)

8 dedicated to segment output only

8 for port or segment use

16 for port, segment, or static use

• Built-in step-up power supply for driving LCD (optionally available)

• Low-power consumption modes (standby modes)

• Stop mode (all oscillations halt in sub-clock mode, current consumption falls to almost zero)

• Sleep mode (the CPU stops to reduce current consumption to approximately 1/3 of normal)

• Clock mode (all operations other than the clock prescaler halt, current consumption is very low)

• Sub clock mode (systems operate on sub-clock signals)

• Maximum 66 I/O ports

• General-purpose I/O ports (N-ch open drain) : 4

• General-purpose I/O ports (N-ch open drain) : 24

• [also function as LCD ports, with restrictions]

• General purpose I/O ports (CMOS) : 38