MC68HC11G5 Datasheet, PDF (90/195 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcontroller

Freescale Semiconductor, Inc.
I4/O5 — Configure TO5I4 register for input capture or output compare
0 – Output compare 5 function enabled (no IC4).
1 – Input capture 4 function enabled (no OC5).
RTR2, RTR1, RTR0 — RTI Interrupt Rate
These bits select one of six rates for the real time periodic interrupt circuit (see
Table 6-1). Reset clears these bits and after reset a full RTI period elapses before
the first RTI interrupt occurs.
Table 6-1. Real Time Interrupt Rates
RTR2 RTR1 RTR0
1
1
0
1
1
1
0
0
0
0
0
1
0
1
0
0
1
1
Divide
E By
2¹¹
2¹²
2¹³
2¹⁴
2¹⁵
2¹⁶
E=
XTAL =
2²³
0.98 ms
1.95 ms
3.91 ms
7.81 ms
15.62 ms
31.25 ms
2.1MHz
XTAL =
8.0MHz
1.02 ms
2.05 ms
4.10 ms
8.19 ms
16.38 ms
32.77 ms
2.0MHz
XTAL =
4.9152MHz
1.67 ms
3.33 ms
6.67 ms
13.33 ms
26.67 ms
53.33 ms
1.2288MHz
XTAL =
4.0MHz
2.05 ms
4.10 ms
8.19 ms
16.38 ms
32.77 ms
65.54 ms
1.0MHz
XTAL =
3.6864MHz
2.22 ms
4.44 ms
8.89 ms
17.78 ms
35.56 ms
71.11 ms
921.6kHz
6-20
PROGRAMMABLE TIMER
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