uPD546
Overview
The NEC uCOM - 43 is a 4- bit parallel central processing unit that forms a single chip microcomputer especially suited for a broad range of low cost and sophisticated controller applications. The uCOM-43 contains all the necessary system functional blocks for a single chip microcomputer, including a 4- bit parallel ALU, 2 , 000 by 8 - bit program ROM, 96 by 4-bit data RAM, 35 input/output channels, a programmable interval timer , interrupt handling circuits, a clock generator and control circuits.
- E, F, G and H I 3 level program counter stack, for 3 level subroutines or 2 level subroutines and an interrupt service. Six 4-bit working registers in a portion of RAM. 2 An interrupt request input line, with interrupt enable/disable capability. Buil
