MC68HC11F1MFN2 FREESCALE [Freescale Semiconductor, Inc], MC68HC11F1MFN2 Datasheet - Page 27

• Manufacturer Part Number: MC68HC11F1MFN2
• Description: Technical Summary 8-Bit Microcontroller
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

CR[1:0] — COP Timer Rate Select
COPRST — Arm/Reset COP Timer Circuitry
HPRIO — Highest Priority I-Bit Interrupt and Miscellaneous
Bits [7:4] — See 4.3 System Initialization Registers, page 20.
PSEL[3:0] — Interrupt Priority Select Bits
MC68HC11F1/FC0
MC68HC11FTS/D
RESET:
RESET:
The COP system is driven by a constant frequency of E/2
tor to arrive at the COP time-out rate.
Write $55 to COPRST to arm the COP watchdog clearing mechanism. Then write $AA to COPRST to
reset the COP timer. Performing instructions between these two steps is possible provided both steps
are completed in the correct sequence before the timer times out.
Can be written only while the I bit in the CCR is set (interrupts disabled). These bits select one interrupt
source to have priority over other I-bit related sources.
Frequency
1 MHz
2 MHz
3 MHz
4 MHz
5 MHz
6 MHz
Any E
RBOOT
Bit 7
Bit 7
7
0
-0/+32.768 ms
-0/+16.384 ms
-0/+10.923 ms
-0/+8.192 ms
-0/+6.554 ms
-0/+5.461 ms
Tolerance
-0/+2
SMOD
6
6
0
6
PSEL[3:0]
15
Freescale Semiconductor, Inc.
/E
Table 13 Highest Priority Interrupt Selection
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
Table 12 COP Watchdog Time-Out Periods
For More Information On This Product,
MDA
5
5
0
5
CR[1:0] = 00
32.768 ms
16.384 ms
10.923 ms
8.192 ms
6.554 ms
5.461 ms
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Timer Overflow
Pulse Accumulator Overflow
Pulse Accumulator Input Edge
SPI Serial Transfer Complete
SCI Serial System
Reserved (Default to IRQ)
IRQ (External Pin)
Real-Time Interrupt
Timer Input Capture 1
Timer Input Capture 2
Timer Input Capture 3
2
15
/E
IRV
4
4
0
4
Interrupt Source Promoted
CR[1:0] = 01
131.072 ms
65.536 ms
43.691 ms
32.768 ms
26.214 ms
PSEL3
21.845
2
3
3
3
0
0
17
/E
15
. CR[1:0] specify an additional divide-by fac-
PSEL2
2
2
2
1
0
CR[1:0] = 10
524.288 ms
262.144 ms
174.763 ms
131.072 ms
104.858 ms
87.381 ms
2
19
/E
PSEL1
1
1
1
0
0
CR[1:0] = 11
699.051 ms
524.288 ms
419.430 ms
349.525 ms
PSEL0
Bit 0
Bit 0
2.097 s
1.049 s
0
1
2
0
21
/E
$x03A
$x03C
27