HD404654 Series
4-Bit Single-Chip Microcomputer
Rev.
7.
0 Sept.
1999
Description
The HD404654 Series is a member of the HMCS400-series of microcomputers designed to increase program productivity with large-capacity memory.
Each microcomputer has a high-precision dual-tone multi-frequency (DTMF) generator, three timers, serial interface,
voltage comparator, and input capture circuit.
The HD404654 Series includes three chips: the HD404652 with 2 k-word ROM; the HD404654 with 4 kword ROM; and the HD4074654 with 4 k-word PROM (ZTAT™ version).
The HD4074654 is a PROM version (ZTAT™ microcomputer).
A program can be written to the PROM by a PROM writer, which can dramatically shorten system developm...