MSM63238

• Rich instruction set
   439 instructions
  Transfer, rotate, increment/decrement, arithmetic operations, comparison, logic operations,mask operations, bit operations, ROM table reference, external memory transfer, stack operations, flag operations, branch, conditional branch, call/return, control.
• Rich selection of addressing modes
  Indirect addressing of four data memory types, with current bank register, extra bank register, HL register and XY register.Data memory bank internal direct addressing mode.
• Processing speed
  Two clocks per machine cycle, with most instructions executed in one machine cycle.
  Minimum instruction execution time : 61 s (@ 32.768 kHz system clock)
                                                            1 s (@ 2 MHz system clock)
• Clock generation circuit
   Low-speed clock : 32.768 kHz crystal oscillator
   High-speed clock : 2 MHz (Max.) RC or ceramic oscillator select
• Program memory space
   4K words
   Basic instruction length is 16 bits/1 word
• Data memory space
   384 nibbles
• External data memory space
   64 Kbytes (expandable by using an I/O port)
• Stack level
   Call stack level : 8 levels
   Register stack level : 16 levels
• I/O ports
   Input ports: Selectable as input with pull-up resistance/input with pull-down resistance/high-impedance input
  Output ports: Selectable as P-channel open drain output/N-channel open drain output/CMOS output/high-impedance output
  Input-output ports: Selectable as input with pull-up resistance/input with pull-down resistance/high-impedance input
Selectable as P-channel open drain output/N-channel open drain output/CMOS output/high-impedance output Can be interfaced with external peripherals that use a different power supply than this device uses.
   Number of ports:
   Input port : 2 ports * 4 bits
   Output port : 4 ports * 4 bits
   Input-output port : 3 ports * 4 bits
• Buzzer function
   Buzzer output : 0.946 to 5.461 kHz (adjustable in 15 steps)
   Buzzer output modes : Intermittent sound 1, 2; simple sound; continuous sound
• LCD driver
   Number of segments : 512 Max. (32 SEG * 16 COM)
   1/1 to 1/16 duty
   1/4 or 1/5 bias (regulator built-in)
   Selectable as all-on mode/all-off mode/power down mode/normal display mode Adjustable contrast
• Reset function
   Reset through RESET pin
   Power-on reset
   Reset by low-speed oscillation halt
• Battery check
   Low-voltage supply check
   Criterion voltage : Can be selected as 1.05 ±0.10 V, 1.30 ±0.15 V,
   2.20 ±0.20 V or 2.80 ±0.30 V
• Power supply backup
   Backup circuit (voltage multiplier) enables operation at 0.9 V minimum
• Timers and counter
   Watchdog timer * 1
    Overflows in 2 sec.
    100 Hz timer* 1
   Measurable in steps of 1/100 sec.
   15-bit time base counter *1
   1, 2, 4, 8, 16, 32, 64, and 128 Hz signals can be read
• Interrupt sources
   External interrupt : 2
   Internal interrupt : 6 (watchdog timer interrupt is a nonmaskable interrupt)
• Operating voltage
   When backup used : 0.9 to 2.7 V
          (Low-speed clock operating)
   1.2 to 2.7 V
          (Operating frequency: 300 to 500 kHz)
   1.5 to 2.7 V
          (Operating frequency: 200 kHz to 1 MHz)
  When backup not used : 1.8 to 5.5 V
          (Operating frequency: 300 to 500 kHz)
   2.2 to 5.5 V
          (Operating frequency: 300 kHz to 1 MHz)
   2.7 to 5.5 V
          (Operating frequency: 200 kHz to 2 MHz)
• Package:
   128-pin plastic QFP (QFP128-P-1420-0.50-K) : (Product name: MSM63182-xxxGS-K)
                                                                  Chip : (Product name: MSM63182-xxx)
                                                                  xxx indicates a code number.

The MSM63238 is a CMOS 4-bit microcontroller with a built-in POCSAG (Post Office Code Standardization Advisory Group) decoder.

The MSM63238 employs Oki's original nX-4/250 CPU core and is suitable for pager applications.

The MSM63P238 is a one-time-programmable ROM-version product having one-time PROM (OTP) as internal program memory.

The specifications of the MSM63P238 are equal to those of the MSM63238 except for electrical characteristics, packaging (only 80-pin flat package is available for the MSM63P238), and some functions.