A 16bit ARM - (THUMB)This was taken from the newsgroup comp.sys.acorn on 10th June 1994
I got this info from Texas Instruments commercial documentation: ============================================================== [Intro with stuff about how good the ARM7DM 32 bit RISC technology is I agree wholeheartedly!] ARM Documents ARM7DM RISC processor, rev.E, Dec.93, ARM DDI 0010E ARM70DM RISC processor, rev.E, Dec.93, ARM DDI 0021E ARM Software Development Toolkit: -Reference Manual, Oct 93, ARM DUI - 0002B -Technical Specifications, Oct 93, ARM DUI - 0003B -User Manual, Oct 93, ARM DUI, - 0004B -CookBook, Oct 93, ARM DUI, - 0005B -Release Notes, Release 1.6, Oct 93 -C compiler, Assembler & Linker command summary Bibliography: -The ARM RISC Chip, A Programmer's Guide Alex Van Someren and Carol Atack, Addison Wesley, ISBN 0-201-62410-9 [new page] ARM70DT What is the ARM70DT? -The ARM70DT is a 32BIT RISC core Processor using a compact 16 bit instruction set What are the reasons for such processor? -In Portable Systems the cost/size constrains are the leading care abouts -The performance is now a major concern as more functions are required from the controller ARM70DT v ARM70DM CODE DENSITY 65% of ARM70DM ARM70DM ARM70DT Test Suite 1944 Bytes 1264 Bytes PERFORMANCE 150% of ARM70DM in a 8/16 bit environment ARM70DM ARM70DT 8 bit 150 ns Memory 159 ms 97 ms 16 bit 150 ns " 83 ms 54 ms 8 bit 200 ns " 212 ms 129 ms 16 bit 200 ns " 110 ms 71 ms ARM70DT ROADMAP ARM70DT COMPILER V1.0 MAY 94 ARM70DM Pie Board To Simulate ARM70DT JULY 94 ARM70DT TOOLS V2.0 NOV 94 ARM70DTPG FEB 95 ARM70DT First Silicon Samples APRIL 95 ======================================================== Sounds like ARM and Texas are entering the embedded microcontrollers market, where external buses are generally 8/16 bit. Thinking about it, it's a gazillion pieces per year opportunity if ARM comes out with a powerful chip to compete with Motorola's 603xx, 68hc16, Intel 80196s and others...no DOS compat. required, yuppee :-) This is a very smart move IMHO since 32 bit wide buses are much more expensive and claim a larger board space, hence the ARM/Texas chips can appeal a much larger audience. Also, being involved in Real Time sw, I know how handy an all-conditional instruction set would be...RT is a field where the excellent ARM assembler would shine. But, apart from the external interface, what is this 16bit instruction set? How come it's faster? Anyone@ARM.LTD care to explain? My bet is that we will see some ARM core with HW uarts, RAM, ROM, timers and other peripherals on chip later or (better) sooner. It's about time to phase out my 68HC11 board at home :-) Hopefully. -- Maurizio Long live Acorn Name and Address witheld by request.