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型號：	M32185F4VFP
元件分類：	微控制器/微處理器
英文描述：	32-BIT, FLASH, 80 MHz, RISC MICROCONTROLLER, PQFP144
封裝：	20 X 20 MM, 0.50 MM PITCH, PLASTIC, LQFP-144
文件頁數：	1017/1032頁
文件大?。?/td>	5750K
代理商：	M32185F4VFP

INSTRUCTION PROCESSING TIME

Appendix 2.1 32185/32186 Instruction Processing Time

Appendix 2-3

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

The following shows the number of memory access cycles in the IF and MEM stages. Shown here are the mini-

mum number of cycles required for memory access. Therefore, these values do not always reflect the number of

cycles actually required for memory or bus access.

In write access, for example, although the CPU finishes the MEM stage by only writing to the write buffer, this

operation actually is followed by a write to memory. Depending on the memory or bus state before or after the CPU

requests a memory access, the instruction processing may take more time than the calculated value.

R (read cycle)

When existing in the instruction queue .................................................. 1 CPUCLK cycle

When reading the internal resource (RAM) ............................................. 1 CPUCLK cycle

When reading the internal resource (ROM) ............................................ 2 CPUCLK cycles

When reading the internal resource (SFR) (byte or halfword) .................... 4 CPUCLK cycles

When reading the internal resource (SFR) (word) .................................... 8 CPUCLK cycles

When reading external memory (byte or halfword) ................................... 1 CPUCLK + 1 CLKOUT cycles (Note 1)

When reading external memory (word) ................................................... 1 CPUCLK + 2 CLKOUT cycles (Note 1)

When successively fetching instructions from external memory ............... 2 CLKOUT cycles (Note 1)

W (write cycle)

When writing to the internal resource (RAM) .......................................... 1 CPUCLK cycle

When writing to the internal resource (SFR) (byte or halfword) .................. 4 CPUCLK cycles

When writing to the internal resource (SFR) (word) ................................. 8 CPUCLK cycles

When writing to external memory (byte or halfword) ................................ 1 CLKOUT cycle (Note 1)

When writing to external memory (word) ................................................ 2 CLKOUT cycles (Note 1)

Note 1: This applies when external memory is accessed with zero wait state. The instruction processing

time increases by 1 CLKOUT when one wait state is inserted.

Note: CLKOUT and CPUCLK have the relationship 1 CLKOUT = 8 CPUCLK. When CLKOUT = BCLK is

selected with CLKOUT select register, the relationship 1 CLKOUT = 4 CPUCLK is set.

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