Mitsubishi 740
The Mitsubishi 740, also known as MELPS 740, is a series of 8-bit CMOS microcontrollers and microprocessors with an enhanced MOS Technology 6502 compatible core based on the expanded WDC 65C02.
[1] The 740 family was primarily intended for single-chip implementations, and included optional RAM and ROM or EPROM on-die.
[3] In 2002, Mitsubishi Electric and Hitachi agreed to merge their chip operations into a new $7 billion semiconductor company to be called Renesas Technology.
[4] Renesas Technology was established on April 1, 2003, as a joint venture of Hitachi (55%) and Mitsubishi Electric (45%).
The Mitsubishi 740 family has a processor core that executes a superset of the 6502 instruction set including many of the extensions added in the 65C02.
[1] The major change in the 740 family compared to the 65C02 is the addition of a new processor status flag, T, in the formerly unused bit 6.
This allowed the program to select a location in the zero page to act as a sort of second accumulator, setting the X register to point to it, and then removing that address from the instruction format.
As most members of the 740 family have the zero page implemented on-die (instead of in external RAM), using the SPSB allows programs to have a working system entirely in a single chip, with appropriate ROMs.
Many members of the 740 family include on-die ROM or EPROM as well, allowing for complete single-chip implementations of small programs like device drivers.
Additionally, the original 65C02's STZ single-instruction STore Zero was not retained, but this functionality was partially replaced by LDM.
[1] Incorporated into this particular IC are the following:[1] The M50734SP/FP and the M50734SP/FP-10 are unique CMOS LSI microprocessor with UART, clocked serial I/O, analog-to-digital converter, VCU, watchdog timer and 32-bit parallel I/O arranged around the M5040 CPU core.
Use of the CMOS process enables low power consumption, making the M50734SP also suitable for applications where battery-powered operation is required.
