GENERAL DESCRIPTION
The MSM66509/66P509 is a high-performance 16-bit microcontroller that employs OKI original nX-8/500 CPU core.
The MSM66509/66P509 includes a 16-bit CPU, ROM, RAM, a 10-bit A/D converter, serial ports, flexible timers, pulse-width modulator (PWM), and I/O ports.

FEATURES
• Program memory space : 64K bytes
   Internal ROM : 64K bytes
• Data memory space : 64K bytes
   Internal RAM : 2K bytes
• High-speed execution
   Minimum instruction execution time : 125nsec @ 32MHz
• Powerful instruction set : Instruction set superior in orthogonal matrix
                                   8/16-bit data transfer instructions
                                   8/16-bit arithmetic instructions
                                   Multiplication and division operation
                                   instructions
                                   Bit manipulation instructions
                                   Bit logic instructions
                                   ROM table reference instructions
• Abundant addressing modes : Register addressing
                                          Page addressing
                                          Pointing register indirect addressing
                                          Stack addressing
                                          Immediate addressing
• I/O port
   Analog input port : 1 port · 16 bits
   Input-output port : 11 ports · 8 bits, 1 port · 4 bits
   (Input/output setting available in bit unit)
• Flexible timers
   Free run counters : 19-bit · 1, 16-bit · 1
   19-bit CAP with a divider : 4
   16-bit double buffer RTO : 6
   16-bit PWM/RTO : 2
   16-bit CAP/RTO : 2
• 8-bit general timer : 1
   8-bit event counter : 1
• 16-bit PWM : 6
   Input clock divider : 4
• Serial ports
   UART mode with BRG : 1
   Synchronous/UART switchable mode
   with BRG : 1
• 10-bit A/D converter : 16 channels
• Transition detector : 6
• Watchdog timer : 1
• Interrupts
   Non-maskable : 1
   Maskable : Internal 32/external 2
                  (4-level priority can be set)
• ROM window function
• Standby modes
   HALT mode
   STOP mode
• Package
   128-pin plastic QFP (QFP128-P-2828-0.80-BK) : (Product name: MSM66509-xxxGS-BK)
                                                                            ··· indicates the code number.