MSM6404

E2E0013-38-93 ¡ Semiconductor ¡ Semiconductor MSM6404A/6404VS High speed and High performance 4-Bit Microcontroller This MSM6404A/6404VS version: Sep. 1998 Previous version: Mar. 1996 GENERAL DESCRIPTION The MSM6404A microcontroller is a low-power device implemented in complementary metaloxide semiconductor technology. The MSM6404A is optimized for high-speed processing and complicated-control applications. The MSM6404VS is a CMOS 4-bit microcontroller that employs an external EPROM using a piggy-back package in place of the program memory (ROM) internal to the MSM6404A. The MSM6404VS can be used for program development verification because the programs can be modified by programming an external EPROM 2732 equivalent or 2764A equivalent. FEATURES Mask ROM (MSM6404A) : 4000 words ¥ 8 bits External ROM (MSM6404VS) : 8196 words ¥ 8 bits RAM (including the stack area) : 256 words ¥ 4 bits I/O port Input-output port : 8 ports ¥ 4 bits Input port : 1 port ¥ 4 bits 4 bits are for input ports having a latch; the other 32 bits are input/output ports that allow bit manipulation Three built-in counters : 12-bit time-base counter 12-bit programmable timer 8-bit high-speed programmable timer/event counter Built-in 8-bit serial I/O register (with 3-bit counter) Five interrupts with five priority levels (4 internal, 1 external) 32 stacks (in RAM) Power-down features Minimum instruction execution time : 952 ns @ 4.2 MHz clock Instruction systems suitable for control ...