Datasheet

Chapter 7 Enhanced Capture Timer (S12ECT16B8CV2)
MC9S12XDP512 Data Sheet, Rev. 2.21
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
TCNT15 TCNT14 TCNT13 TCNT12 TCNT11 TCNT10 TCNT9 TCNT8
W
Reset 00000000
Figure 7-7. Timer Count Register High (TCNT)
76543210
R
TCNT7 TCNT6 TCNT5 TCNT4 TCNT3 TCNT2 TCNT1 TCNT0
W
Reset 00000000
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: 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.