GENERAL DESCRIPTION

The MSM80C154S/MSM83C154S, designed for the high speed version of the existing

MSM80C154/MSM83C154, is a higher performance 8-bit microcontroller providing low-power

consumption.

The MSM80C154S/MSM83C154S covers the functions and operating range of the existing

MSM80C154/83C154/80C51F/80C31F.

The MSM80C154S is identical to the MSM83C154S except it does not contain the internal

program memory (ROM).

FEATURES

• Operating range

  Operating frequency : 0 to 3 MHz (Vcc=2.2 to 6.0 V)

                               0 to 12 MHz (Vcc =3.0 to 6.0 V)

                               0 to 24 MHz (Vcc =4.5 to 6.0 V)

  Operating voltage : 2.2 to 6.0 V

  Operating temperature : –40 to +85°C (Operation at +125°C conforms to the other specification.)

• Fully static circuit

• Upward compatible with the MSM80C51F/80C31F

• On-chip program memory : 16K words x 8 bits ROM (MSM83C154S only)

• On-chip data memory : 256 words x 8 bits RAM

• External program memory address space : 64K bytes ROM (Max)

• External data memory address space : 64K bytes RAM

• I/O ports : 4 ports x 8 bits (Port 1, 2, 3, impedance programmable) : 32

• 16-bit timer/counters : 3

• Multifunctional serial port : I/O Expansion mode

                                     : UART mode (featuring error detection)

• 6-source 2-priority level

   Interrupt and multi-level

   Interrupt available by programming IP and IE registers

• Memory-mapped special function registers

• Bit addressable data memory and SFRs

• Minimum instruction cycle : 500 ns @ 24 MHz operation

• Standby functions : Power-down mode (oscillator stop)

                            Activated by software or hardware; providing

                            ports with floating or active status

                            The software power-down stet mode is termi

                            nated by interrupt signal enabling execution from

                            the interrupted address.