mc68hc711k4 Freescale Semiconductor, Inc, mc68hc711k4 Datasheet - Page 109

• Manufacturer Part Number: mc68hc711k4
• Description: Hcmos Microcontroller Unit
• Manufacturer: Freescale Semiconductor, Inc

5.3.3.2 System Configuration Options Register
M68HC11K Family
MOTOROLA
E Clock Freq.
EXTAL Freq.
Control Bits
SPR[2:0]
0 0
0 1
1 0
1 1
NOTE:
0/+16.384 ms
262.144 ms
16.384 ms
65.536 ms
1.049 sec
8.0 MHz
2.0 MHz
Address: $0039
Two bits in the OPTION register select one of four values for the COP
timer.
CR[1:0] — COP Timer Rate Select Bits
In normal operating modes, these bits can be written only once within 64
bus cycles after reset.
Reset:
Read:
Write:
Figure 5-2. System Configuration Options Register (OPTION)
The MCU derives the counter for the COP timer by dividing the
system E clock by 2
by CR[1:0] as shown in
that condition selects the fastest timeout period.
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0/+10.923 ms
174.763 ms
699.051 ms
10.923 ms
43.691 ms
12.0 MHz
3.0 MHz
ADPU
Bit 7
0
Table 5-2. COP Timeout
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Resets and Interrupts
EXTAL Frequencies
CSEL
COP Timeout
6
0
0/+8.192 ms
131.072 ms
524.288 ms
32.768 ms
16.0 MHz
8.192 ms
4.0 MHz
15
IRQE
and applying a further scaling factor selected
5
0
Table
0/+6.544 ms
DLY
5-2. After reset, these bits are 0, and
104.858 ms
419.430 ms
26.214 ms
20.0 MHz
4
1
6.554 ms
5.0 MHz
CME
3
0
0/+5.461 ms
349.525 ms
21.845 ms
87.381 ms
24.0 MHz
5.461 ms
6.0 MHz
FCME
2
0
Resets and Interrupts
Sources of Resets
CR1
1
0
Other EXTAL
Technical Data
EXTAL
0/+2
Timeout
2
2
2
2
15
17
19
21
15
Bit 0
CR0
E
E
E
E
0
E
4
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