Renesas R0E530640MCU00 用户手册
R0E530640MCU00 User’s Manual
5. Debugging Functions
REJ10J1733-0100 Rev.1.00 Apr. 01, 2008
Page 195 of 229
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 resolution + 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.