mc68hc11f1cpu5 Freescale Semiconductor, Inc, mc68hc11f1cpu5 Datasheet - Page 63

• Manufacturer Part Number: mc68hc11f1cpu5
• Description: 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

RTIF — Real-Time Interrupt Flag
Bits [5:4] — See 13.2 Pulse Accumulator Registers, page 65.
Bits [3:0] — Not implemented. Reads always return zero and writes have no effect.
PACTL — Pulse Accumulator Control
Bit 7 — Not implemented. Reads always return zero and writes have no effect.
Bits [6:4] — See 13.2 Pulse Accumulator Registers, page 65.
Bit 3 — Not implemented. Reads always return zero and writes have no effect.
I4/O5 — Configure TI4/O5 Register for IC or OC
RTR[1:0] — RTI Interrupt Rate Selects
MC68HC11F1/FC0
MC68HC11FTS/D
RESET:
Set periodically at a rate based on bits RTR[1:0] in the PACTL register.
These two bits select one of four rates for the real-time interrupt circuit, as shown in Table 32.
0 = OC5 function enabled
1 = IC4 function enabled
Frequency
E-Clock
1 MHz
2 MHz
3 MHz
4 MHz
5 MHz
6 MHz
Any E
Bit 7
0
0
PAEN
RTR [1:0] = %00
6
0
8.192 ms
4.906 ms
2.731 ms
2.048 ms
1.638 ms
1.366 ms
2
13
/E
Table 32 Real-Time Interrupt Periods
PAMOD
5
0
PEDGE
RTR [1:0] = 01
16.384 ms
4
0
8.192 ms
5.461 ms
4.096 ms
3.277 ms
2.731 ms
2
14
/E
3
0
0
RTR [1:0] = 10
32.768 ms
16.384 ms
10.923 ms
I4/O5
8.192 ms
6.554 ms
5.461 ms
2
0
2
15
/E
RTR1
1
0
RTR [1:0] = 11
65.536 ms
32.768 ms
21.845 ms
16.384 ms
13.107 ms
10.923 ms
RTR0
Bit 0
2
16
0
/E
MOTOROLA
$x026
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