Overview
The MSM66591/ML66592 are high performance 16-bit microcontrollers that contain a 16-bit CPU (nX-8/500S), ROM, RAM, a 10-bit A/D converter, serial ports, flexible timers, and PWMs.
The ML66592 is the same as the MSM66591 with the exception that the ML66592 has an increased ROM and RAM capacity and a higher operating speed. Table 1-1 lists the functional differences between the MSM66591 and ML66592.
The MSM66Q591 is a Flash EEPROM version of the MSM66591. The ML66Q592 is a Flash EEPROM version of the ML66592.

Features
Abundant Instruction Set
    • Instruction set has superb orthogonal capability
    • 8/16-bit arithmetic instructions
    • Multiplication/division instructions
    • Bit operation instructions
    • Bit logic operation instructions
    • ROM table reference instructions

Abundant Addressing Modes
    • Register addressing
    • Page addressing
    • Pointing register indirect addressing
    • Stack addressing
    • Immediate addressing

Minimum Instruction Cycle
    MSM66591: 83.3 nsec @ 12 MHz (internal: 24 MHz)
    ML66592: 71.4 nsec @ 14 MHz (internal: 28 MHz)

Program Memory (ROM)
    MSM66591: Internal: 128K bytes External: 128K bytes, EA pin active
    ML66592: Internal: 192K bytes External: 256K bytes (EA pin active)

Data memory (RAM)
    MSM66591: Internal: 6K bytes
    ML66592: Internal: 8K bytes

I/O Ports
    • Analog input ports: 24
    • I/O ports: 98

Multiplier
    MSM66591: MUL ERn instruction: 208 nsec @ 12 MHz
    ML66592: MUL ERn instruction: 178.6 nsec @ 14 MHz
(Continue ...)