MSM6545L

E2E0019-38-94 ¡ Semiconductor MSM6545/6575/6545L/6575L ¡ Semiconductor Operatable at 0.9 V and Built-in Buzzer Circuit 4-Bit Microcontroller This version: Sep. 1998 MSM6545/6575/6545L/6575L Previous version: Mar. 1996 GENERAL DESCRIPTION MSM6545/6575/6545L/6575L is a 4-bit, low-power microcontroller manufactured in a CMOS silicon gate process. The microcontroller can be initialized and operated at a low supply voltage of 0.9 V. This single device contains a crystal oscillator circuit, voltage converter circuits, a time base counter, a ROM, a RAM, a stack RAM, I/O ports, interrupt function components, a serial I/O www.DataSheet4U.com port, a buzzer output circuit, and an updown counter. This IC is driven by one battery and is well suited to products that need to be operated under low power consumption. FEATURES The IC can be initialized and operated even at a low voltage of 0.9 V. Low power consumption ROM : 4096 words ¥ 17 bits (MSM6545/6545L) 2048 words ¥ 17 bits (MSM6575/6575L) RAM : 256 words ¥ 4 bits (MSM6545/6545L) 128 words ¥ 4 bits (MSM6575/6575L) I/O port Input-output port : 7 ports ¥ 4 bits Input port : 1 port ¥ 4 bits Interrupt functions (real-time interrupt, external interrupt, and serial interrupt) Serial I/O port : 8-bit sync communication Buzzer output circuit 4-bit decimal updown counter 73 instructions Minimum instruction execution time : 61 ms Operation under single 1.5 V power supply (MSM6545/6575) A mask option allows the 3 V pow...