GENERAL DESCRIPTION
The MSM64P155 (1.5 V)/64P155L (3.0 V) is a one-time-programmable ROM version product, which has one-time PROM (OTP) as internal program memory. On the other hand, the MSM64155 is a mask ROM-version product, which has mask ROM as internal program memory. Unlike the mask ROM-version MSM64155 which has a P-well CMOS structure, the MSM64P155/64P155L has been fabricated with the N-well CMOS-structured EPROM process technology.
Therefore, the MSM64P155/64P155L differs from the MSM64155 in the polarity of the power supply for LCD bias generation and in the external circuit structure.
Unlike the mask ROM-version product, the MSM64P155/64P155L cannot be supplied in the form of a chip. The MSM64P155/64P155L is an OTP-version product used to evaluate an application program.
The MSM64P155/64P155L has two operation modes, microcontroller operation mode and PROM mode. The microcontroller operation mode is used to operate the MSM64P155/64P155L like a mask ROM-version product and the PROM mode is used to program or read the PROM.

FEATURES
• Operating range
   Operating voltage (mask option) : 1.5 V/3.0 V
   Operating frequency :
      32.768 kHz crystal oscillation
      Approx. 32 kHz RC oscillation
• Minimum instruction execution time : 91 ms
• General memory space : 4064 bytes (PROM)
• Local memory space : 256 nibbles
• LCD driver :
   64
   Common driver · 4
   Segment driver · 60
   1/4 duty, 1/3 bias; 240 segments (60 · 4)
   1/3 duty, 1/3 bias; 180 segments (60 · 3)
• I/O port
   Input-output port :
      2 ports · 4 bits (open-drain output/CMOS output
      selectable; pull-down resistor input/high-impedance input selectable)
   Input port : 1 port ·
      2 bits (pull-down resistor input/high-impedance input selectable)
      1 port · 4 bits (pull-down resistor input/high-impedance input selectable)
   Output port : 1 port · 4 bits (CMOS output)
• Event counter : 1 channel
• Melody output : 2
• Capture circuits :
   2 channels
   256 Hz, 128 Hz, 64 Hz, 32 Hz
• Interrupt sources :
   10 sources
   External 4, time base 4, melody 2
   (When TST3 = "1", six time base sources)
• Clock generation circuit (mask option) : Crystal/RC oscillation
• Package:
   100-pin plastic QFP (QFP100-P-1420-0.65-BK)
   Product name :
      MSM64P155-001GS-BK (crystal oscillation, 1.5 V, blanked PROM)
      MSM64P155L-002GS-BK (crystal oscillation, 3.0 V, blanked PROM)
      MSM64P155-003GS-BK (RC oscillation, 1.5 V, blanked PROM)
      MSM64P155L-004GS-BK (RC oscillation, 3.0 V, blanked PROM)
      MSM64P155-xxxGS-BK (crystal/RC oscillation, 1.5 V, written PROM)
      MSM64P155L-xxxGS-BK (crystal/RC oscillation, 3.0 V, written PROM)
      xxx indicates a code number.