KEIL软件使用Debug时程序运行时间sec一直为0是为什么，怎么解决

我说错了，今天看了keil关于C8051F340的仿真说明，是因为KEIL不完全支持340软件仿真所致。
详情
dd/chip/3997.htm
NOTE：
Simulation
for
this
device
is
provided
by
the
default
peripheral
simulation
driver.Complete
peripheral
simulation
is
not
available
at
this
time.
The
following
on-chip
peripherals
are
not
simulated.
Crossbar
External
&
On-Chip
memory
Interrupts
(Including
External)
Port
0
Port
1
Port
2
Port
3
Power
Saving
Modes
(Idle
and
Power
Down)
Serial
UART
0
(Enhanced
Interface)
Timer
0
Timer
1
Timer
2
上述外设keil都不支持软件仿真。