
Chapter 7 Enhanced Capture Timer (S12ECT16B8CV2)
MC9S12XDP512 Data Sheet, Rev. 2.17
Freescale Semiconductor
321
7.3.2.5
Timer Count Register (TCNT)
Read: Anytime
Write: Has no meaning or effect
All bits reset to zero.
15
14
13
12
11
10
9
8
R
W
TCNT15
TCNT14
TCNT13
TCNT12
TCNT11
TCNT10
TCNT9
TCNT8
Reset
0
0
0
0
0
0
0
0
Figure 7-7. Timer Count Register High (TCNT)
7
6
5
4
3
2
1
0
R
W
TCNT7
TCNT6
TCNT5
TCNT4
TCNT3
TCNT2
TCNT1
TCNT0
Reset
0
0
0
0
0
0
0
0
Figure 7-8. Timer Count Register Low (TCNT)
Table 7-6. TCNT Field Descriptions
Field
Description
15:0
TCNT[15:0]
Timer Counter Bits
— The 16-bit main timer is an up counter. A read to this register will return the current value
of the counter. Access to the counter register will take place in one clock cycle.
Note:
Aseparateread/writeforhighbyteandlowbyteintestmodewillgiveadifferentresultthanaccessingthem
as a word. 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.