7721 datasheet(461/577 Pages) RENESAS

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APPLICATION

7721 Group User’s Manual

16–58

16.3 Comparison of sample program execution rate

16.3.2 Comparison between software Wait (f(XIN) = 20 MHz) and software Wait + Ready (f(XIN) = 25 MHz)

Figure 16.3.3 shows the execution time ratio when sample programs in Figure 16.3.1 are executed on the

two conditions in Table 16.3.2. Figure 16.3.2 shows the memory assignment at execution rate comparison.

The execution time ratio depends on the program or the usage conditions.

Table 16.3.2 Comparison conditions

Fig. 16.3.2 Memory assignment at execution rate comparison

External SRAM

SFR area

Condition Ready valid area

Insert Wait which is equivalent to 2 cycles

at access

(Software Wait included)

M37721 memory map

Internal SRAM

Program area

External EPROM

Area where software

Wait is valid

Specify either area as work area

Item

Processor mode

f(XIN)

External data bus width

Software Wait

Ready

Program area

Work area

Condition

Microprocessor mode

25 MHz

16 bits

Inserted

Valid only for external EPROM area

External EPROM

Internal or External SRAM

Condition

Microprocessor mode

20 MHz

16 bits

Inserted

Invalid

External EPROM

Internal or External SRAM

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