Renesas M16C/64, Руководство пользователя

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R0E530640MCU00 User’s Manual 5. Debugging Functions
REJ10J1733-0100 Rev.1.00 Apr. 01, 2008
Page 195 of 229
5.13.14 Maximum Measurement Time of the Realtime Profile
(1) Maximum measurement time
The timer used for performance measurement is comprised of a 40-bit counter. The maximum measurement time varies with
the unit of measurement selected.
To select a unit of measurement, specify it in the Measurement interval drop-down list of the Properties dialog box.
The measurable maximum times are listed below.
Table 5.43 Maximum measurement time
No. Resolution Maximum measurement time
1 10ns Approx. 3 hours, 03 minutes, 15 seconds
2 20ns Approx. 6 hours, 06 minutes, 30 seconds
3 40ns Approx. 12 hours, 13 minutes, 00 seconds
4 80ns Approx. 24 hours, 26 minutes, 00 seconds
5 160ns Approx. 48 hours, 52 minutes, 01 seconds
6 1.6us Approx. 488 hours, 40 minutes, 18 seconds
CAUTION
Note that performance measurement produces an error of ± “2 reso 100 ns” (when resolution = 20 ns, ±140 ns)
whenever entering functions. If the resolution is 20 ns and you enter functions 10 times, ±1400 ns error occurs.
(2) Maximum measurement count
Execution counts of the realtime profile are measured using a 16-bit counter. Measurement can be taken of up to a count of
65,535.