MC68HC11A1 MOTOROLA [Motorola, Inc], MC68HC11A1 Datasheet - Page 37

• Manufacturer Part Number: MC68HC11A1
• Description: 8-Bit Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

TFLG2 — Timer Interrupt Flag 2
TOF — Timer Overflow Flag
RTIF — Real-Time (Periodic) Interrupt Flag
PAOVF — Pulse Accumulator Overflow Interrupt Flag
PAIF — Pulse Accumulator Input Edge Interrupt Flag
PACTL — Pulse Accumulator Control
DDRA7 — Data Direction for Port A Bit 7
PAEN — Pulse Accumulator Enable
PAMOD — Pulse Accumulator Mode Select
PEDGE — Pulse Accumulator Edge Select
RTR [1:0] — Real-Time Interrupt (RTI) Rate
MC68HC11A8
MC68HC11A8TS/D
RESET:
RESET:
Clear flags by writing a one to the corresponding bit position(s).
Set when TCNT changes from $FFFF to $0000.
Set periodically. Refer to RTR[1:0] bits in PACTL register.
Refer to 9 Pulse Accumulator.
Refer to 9 Pulse Accumulator.
Refer to 5 Parallel Input/Output.
Refer to 9 Pulse Accumulator.
Refer to 9 Pulse Accumulator.
Refer to 9 Pulse Accumulator.
RTR[1:0]
0 0
0 1
1 0
1 1
DDRA7
Bit 7
TOF
Bit 7
0
0
PAEN
RTIF
6
0
6
0
Divide E By
PAMOD
PAOVF
E =
2
2
2
2
13
14
15
16
5
0
5
0
Table 8 Real-Time Interrupt Rates
PR[1:0]
0 0
0 1
1 0
1 1
PEDGE
PAIF
4
0
4
0
XTAL = 4.0 MHz
16.38 ms
32.77 ms
65.54 ms
1.0 MHz
8.19 ms
3
0
0
3
0
0
Prescaler
2
0
0
2
0
0
16
1
4
8
XTAL = 8.0 MHz
16.384 ms
32.768 ms
4.096 ms
8.192 ms
2.0 MHz
RTR1
1
0
0
1
0
$1025
$1026
RTR0
Bit 0
Bit 0
0
0
0
XTAL = 12.0 MHz
10.923 ms
21.845 ms
2.731 ms
5.461 ms
3.0 MHz
MOTOROLA
37