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Chapter 14 Enhanced Capture Timer (ECT16B8CV3)
MC9S12XE-Family Reference Manual , Rev. 1.07
550
Freescale Semiconductor
14.4.2.5
Timer Count Register (TCNT)
Read: Anytime
Write: Writable in special modes.
All bits reset to zero.
Module Base + 0x0004
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 14-7. Timer Count Register High (TCNT)
Module Base + 0x0005
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 14-8. Timer Count Register Low (TCNT)
Table 14-5. 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:
A separate read/write for high byte and low byte in test mode will give a different result than accessing
them 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.