mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 420

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Chapter 13 Timer Module (TIM16B4CV1)
13.3.2.5
The 16-bit main timer is an up counter.
A full access for the counter register should take place in one clock cycle. A separate read/write for high
byte and low byte will give a different result than accessing them as a word.
Read: Anytime
Write: Has no meaning or effect in the normal mode; only writable in special modes (test_mode = 1).
The period of the first count after a write to the TCNT registers may be a different size because the write
is not synchronized with the prescaler clock.
420
Reset
Reset
W
W
R
R
TCNT15
TCNT7
Timer Count Register (TCNT)
15
0
0
7
TCNT14
TCNT6
14
0
0
6
Figure 13-10. Timer Count Register High (TCNTH)
Figure 13-11. Timer Count Register Low (TCNTL)
TCNT13
TCNT5
MC9S12E256 Data Sheet, Rev. 1.08
13
0
0
5
TCNT12
TCNT4
12
0
0
4
TCNT11
TCNT3
11
0
3
0
TCNT10
TCNT2
10
0
0
2
TCNT9
TCNT1
Freescale Semiconductor
0
0
9
1
TCNT8
TCNT0
0
0
9
0