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Thread: Microcontroller with 4 USARTs and 40 pins
face BY : Sebastian Garcia email (remove spam text)

Edson wrote:

| I'm looking at an Atmel datasheet. It says the AT89C55 can do 33MHz,but
|how much clocks does it takes to execute one instruction? Why few
|manufacturers put this information on the datasheets??? 33Mhz equals to
|33MIPS? Or 8,25MPIS? Or 2,75 MIPS???

If it don't say anything more, it may be the classic 8051's: one machine
cycle is formed by twuelve clock cycles, and the instruction cycle
depends on the particular instruction.

If You want more speed enhacement look at Dallas MCS-51 compatible, hi-speed



<001c01bfc81b$22bf5560$f9315c9d@jamesmax> 7bit

See also: www.piclist.com/techref/io/serials.htm?key=usart
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Subject (change) Microcontroller with 4 USARTs and 40 pins

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