MC68HC11KA4TS Datasheet, PDF (52/68 Pages) Motorola, Inc – 8-Bit Microcontroller

10 Main Timer
The timing system is based on a free-running 16-bit counter with a four-stage programmable prescaler.
A timer overflow function allows software to extend the system's timing capability beyond the counter's
16-bit range.
The timer has three channels of input capture, four channels of output compare, and one channel that
can be configured as a fourth input capture or a fifth output compare. In addition, the timing system in-
cludes pulse accumulator and real-time interrupt (RTI) functions, as well as a clock monitor function,
which can be used to detect clock failures that are not detected by the COP.
Refer to 11 Pulse Accumulator and 10.1 Real-Time Interrupt for further information about these func-
tions. Refer to the following table for a summary of the crystal-related frequencies and periods.
Control
Bits
PR[1:0]
00
1 count —
overflow —
01
1 count —
overflow —
10
1 count —
overflow —
11
1 count —
overflow —
RTR[1:0]
00
01
10
11
CR[1:0]
00
01
10
11
Time-out Tolerance
(–0 ms/+...)
8.0 MHz
2.0 MHz
500 ns
Table 9 Timer Summary
XTAL Frequencies
12.0 MHz
16.0 MHz
3.0 MHz
4.0 MHz
333 ns
250 ns
Main Timer Count Rates
500 ns
32.768 ms
333 ns
21.845 ms
250 ns
16.384 ms
2.0 µs
131.07 ms
1.333 µs
87.381 ms
1.0 µs
65.536 ms
4.0 µs
262.14 ms
2.667 µs
174.76 ms
2.0 µs
131.07 ms
8.0 µs
524.29 ms
4.096 ms
8.192 ms
16.384 ms
32.768 ms
16.384 ms
65.536 ms
262.14 ms
1.049 s
5.333 µs
349.52 ms
4.0 µs
262.14 ms
Periodic (RTI) Interrupt Rates
2.731 ms
5.461 ms
10.923 ms
21.845 ms
2.048 ms
4.096 ms
8.192 ms
16.384 ms
COP Watchdog Time-out Rates
10.923 ms
43.691 ms
174.76 ms
699.05 ms
8.192 ms
32.768 ms
131.07 ms
524.28 ms
16.4 ms
10.9 ms
8.192 ms
Other Rates
(E)
(1/E)
(E/1)
(E/2¹⁶⁾
(E/4)
(E/2¹⁸)
(E/8)
(E/2¹⁹)
(E/16)
(E/2²⁰)
(E/2¹³⁾
(E/214₎
(E/2¹⁵)
(E/2¹⁶)
(E/2¹⁵⁾
(E/217₎
(E/2¹⁹)
(E/2²¹)
(E/2¹⁵)
MOTOROLA
52
MC68HC11KA4
MC68HC11KA4TS/D