MSM66577

1. High-performance CPU
The family includes the high-performance CPU, powerful bit manipulation instruction set, full symmetricaladdressing mode, and ROM WINDOW function, and also provides the best optimized C compiler support.
2. A variety of power saving modes
Attaching a 32.768-kHz crystal produces a real-time clock signal from the internal clock timer. Use of a singleclock in place of dual clocks is possible.
The clock gear function allows a 1/2 × or 1/4 × main clock to be selected for the CPU operating clock.Switching the CPU clock to 32.768-kHz signal, 1/2 × main clock, or 1/4 × main clock, then produces operation ina low power consumption mode.
The family provides a wide range of standby control functions. In addition to the usual STOP mode that stops the
oscillator, there are the quick restart STOP mode that shuts down the CPU and peripherals but leaves the oscillator
running, and the HALT mode that shuts down the CPU but leaves the peripherals running.
3. Variety of multifunctional serial ports
The family includes two channels of built-in synchronous serial ports with 32-byte FIFO implementing an autotransfer function.
The family allows multi-byte 1-frame information which consists of address, command, and data to be easily and efficiently transmitted to or received from a serial interface type peripheral LSI device. The family also allowsmulti-byte character information to be easily and efficiently transmitted to or received from an LCD module.In addition, the family has two channels of combined UART/synchronous serial ports, and provides four channelsof serial interfaces.
4. MSM66Q577LY and MSM66Q577 with flash memory programmable with single power supply
In addition to the regular mask ROM version, the family includes these versions with 128KB of flash memory thatcan be programmed using a single power supply.
For the MSM66Q577LY, an internal booster circuit derives the necessary program voltage from the device's low(3.0 to 3.6V) power supply, and the program voltage for the MSM66Q577 is provided with a single 5 V powersupply (4.5 to 5.5 V).
5. High-precision A/D and D/A converters
The family includes a high-precision 10-bit analog-to-digital converter with eight channels and 8-bit digital-toanalog
converter with two channels.
6. Multifunction PWM
The family supports both 8- and 16-bit PWM operation.
Choosing between the time-base counter output or overflow from an 8-bit auto-reload timer as the PWM counterclock source provides a wide number of possibilities over a broad frequency range. The 16-bit PWM configurationsupports a high-speed synchronization mode that generates a high-precision output signal with less ripple suitablefor digital-to-analog control applications.
7. Programmable pull-up resistors
Building the pull-up resistors into the chip contributes to overall design compactness.
Making them programmable on a per-bit basis allows complete flexibility in circuit board layout and systemdesign. These programmable pull-up resistors are available for all I/O pins not already assigned specific functions(such as the oscillator connection pins).
8. Wide support for external interrupts
There are a total of nine interrupt channels for use in communicating with external devices: eight for maskable interrupts and one for non-maskable interrupts.

The MSM66577 family of highly functional CMOS 16-bit single chip microcontrollers utilizes the nX-8/500S,Oki's proprietary CPU core.
Four channels of serial ports of MSM66577, consisting of two channels of synchronous serial ports with 32-byte FIFO registersand two channels of UART/synchronous serial ports, enable easy interfacing with external peripheral LSI devicessuch as an encoder/decoder or servocontroller.
A switching function permits selection of separate address and data lines or multiplexed lines for the external bus interface to correspond to various peripheral LSI devices.
With features such as a clock gear function, dual clock function, STOP/HALT mode, programmable pull-up portsin which individual bits can be programmed, and a small, thin package, the MSM66577 family of microprocessorsis optimally suited for the system control of small-sized low power devices.
The flash ROM version (MSM66Q577LY) programmable with a single 3V power supply (3.0 to 3.6V) and flashROM version (MSM66Q577) programmable with a single 5V power supply (4.5 to 5.5V) are also included in thefamily. These versions are easily adaptable to sudden specification changes and to new product versions.