MC68HC05K0 Datasheet, PDF (81/154 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Multifunction Timer
Timer Counter Register
8.4 Timer Counter Register
A 15-stage ripple counter is the core of the timer. The value of the first
eight stages is readable at any time from the read-only timer counter
register shown in Figure 8-3.
Address: $0009
Bit 7
6
5
4
3
2
1
Read: TCR7 TCR6 TCR5 TCR4 TCR3 TCR2 TCR1
Write:
Reset: 0
0
0
0
0
0
0
= Unimplemented
Figure 8-3. Timer Counter Register (TCNTR)
Bit 0
TCR0
0
Power-on clears the entire counter chain and begins clocking the
counter. After 4064 cycles, the power-on reset circuit is released,
clearing the counter again and allowing the MCU to come out of reset.
A timer overflow function at the eighth counter stage allows a timer
interrupt every 1024 internal clock cycles.
Each count of the timer counter register takes eight oscillator cycles or
four cycles of the internal clock.
MC68HC05K0 • MC68HC05K1 — Rev. 2.0
Multifunction Timer
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Technical Data