CSG 65CE02

The CSG 65CE02 is an 8/16-bit microprocessor developed by <a href="/facts/Commodore_Semiconductor_Group/1eKsjBS1">Commodore Semiconductor Group</a> in 1988. It is a member of the <a href="/facts/MOS_Technology_6502/q9YLwkzm">MOS Technology 6502</a> family, developed from the <a href="/facts/CMOS/7g2EwHGA">CMOS</a> <a href="/facts/WDC_65C02/XyP1EdgY">WDC 65C02</a> released by the <a href="/facts/Western_Design_Center/0qbtCT5p">Western Design Center</a> in 1983.
Like the 65C02, the 65CE02 was built on a 2 µm CMOS process instead of the original 6502's 8 µm <a href="/facts/NMOS_logic/6hup3T21">NMOS</a> technology, making the chip smaller (and thus less expensive) as well as using much less power. In addition to changes made in the 65C02, the 65CE02 also included improvements to the <a href="/facts/Instruction_pipelining/3zy6CcX1">processor pipeline</a> to allow one-byte instructions to complete in 1 cycle, rather than the 6502's (and most variants) minimum of 2 cycles. It also removed 1 cycle delays when crossing <a href="/facts/Page_(computer_memory)/CNGruG1H">page</a> boundaries. These changes improved performance as much as 25% at the same clock speed.
Other changes included the addition of a third <a href="/facts/Index_register/pdhWVmHA">index register</a>, Z, along with the addition and modification of a number of instructions to use this register. The zero-page, the first 256 bytes of memory that were used as pseudo-registers, could now be moved to any page in <a href="/facts/Main_memory/wPHKFpdx">main memory</a> using the B(ase page) register. The <a href="/facts/Stack_register/eWgwlmtz">stack register</a> was widened from 8 to 16-bits using a similar page register, SPH (stack pointer high), allowing the stack to be moved out of page one and to grow to larger sizes.
The 65CE02 was the basis for the <a href="/facts/System_on_a_chip/1RVvVe6N">system on a chip</a> CSG 4510 that was developed for the unreleased <a href="/facts/Commodore_65/AauB7osR">Commodore 65</a>. The 65CE02 was later used for the A2232 <a href="/facts/Serial_port/VpcrH530">serial port</a> card for the <a href="/facts/Amiga/60B3A9of">Amiga</a> computer. It appears to have seen no other use.

CSG 65CE02 open-in-new

CSG 65CE02