MC68HC711K4CFN4 Datasheet, PDF (70/80 Pages) Motorola, Inc – 8-Bit Microcontroller

PEDGE —Pulse Accumulator Edge Control
Refer to 11 Pulse Accumulator.
Bit 3 —Not implemented
Always reads zero
I4/O5 —Input Capture 4/Output Compare 5
Configure TI4/O5 for input capture or output compare
0 = OC5 enabled
1 = IC4 enabled
RTR[1:0] —Real-Time Interrupt (RTI) Rate
Refer to 10.1 Real-Time Interrupt.
10.1 Real-Time Interrupt
These rates are a function of the MCU oscillator frequency and the value of the software-accessible
control bits, RTR1 and RTR0. These bits determine the rate at which interrupts are requested by the
RTI system. The RTI system is driven by an E divided by 2¹³ rate clock compensated so that it is inde-
pendent of the timer prescaler. The RTR1 and RTR0 control bits select an additional division factor. RTI
is set to its fastest rate by default out of reset and can be changed at any time.
RTR[1:0]
00
01
10
11
Table 12 Real-Time Interrupt Rates (Period Length)
Period Length
Selected
2^{13 ÷}E
2^{14 ÷}Ε
2^{15 ÷}Ε
2^{16 ÷}Ε
E = 2.0 MHz
4.096 ms
8.192 ms
16.384 ms
32.768 ms
Period Length
E = 3.0 MHz
2.731 ms
5.461 ms
10.923 ms
21.845 ms
E = 4.0 MHz
2.048 ms
4.096 ms
8.192 ms
16.383 ms
RTR[1:0]
00
01
10
11
Table 13 Real-Time Interrupt Rates (Frequency)
Rate Selected
E ÷2¹³
E ÷2¹⁴
E ÷2¹⁵
E ÷2¹⁶
E = 2.0 MHz
244.141 Hz
122.070 Hz
61.035 Hz
30.518 Hz
Frequency
E = 3.0 MHz
366.211 Hz
183.105 Hz
91.553 Hz
45.776 Hz
E = 4.0 MHz
488.281 Hz
244.141 Hz
122.070 Hz
61.035 Hz
MOTOROLA
70
M68HC11 K Series
MC68HC11KTS/D