mc68hc05ct4fn Freescale Semiconductor, Inc, mc68hc05ct4fn Datasheet - Page 83

• Manufacturer Part Number: mc68hc05ct4fn
• Description: Mc68hc05 Family Of Microcontrollers Mcus
• Manufacturer: Freescale Semiconductor, Inc

10.4 Core Timer Counter Register
MC68HC05CT4
—
Rev. 2.0
Address
The timer counter register is a read-only register that contains the
current value of the 8-bit ripple counter at the beginning of the timer
chain. This counter is clocked by the CPU clock (E/4) and can be used
for various functions including a software input capture. Extended time
periods can be attained using the TOF function to increment a temporary
RAM storage location, thereby simulating a 16-bit (or more) counter.
The power-on cycle clears the entire counter chain and begins clocking
the counter. After 4064 cycles, the power-on reset circuit is released,
which again clears the counter chain and allows the device to come out
of reset. At this point, if RESET is not asserted, the timer starts counting
up from zero and normal device operation begins. When RESET is
asserted any time during operation (other than POR), the counter chain
is cleared.
Reset:
Read:
Write:
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Bit 7
D7
0
Figure 10-3. Core Counter Register (CTCR)
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= Unimplemented
D6
6
0
Core Timer
D5
5
0
D4
4
0
D3
3
0
General Release Specification
Core Timer Counter Register
D2
2
0
D1
1
1
Core Timer
Bit 0
D0
1