MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 681

• Manufacturer Part Number: MPC555CME
• Description: KIT EVALUATION FOR MPC555
• Manufacturer: Freescale Semiconductor
• Type: Microcontrollerr

Specifications of MPC555CME

• Contents: Module Board, Installation Guide, Power Supply, Cable, Software and more
• Processor To Be Evaluated: MPC555
• Data Bus Width: 32 bit
• Interface Type: RS-232
• For Use With/related Products: MPC555
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

19.7.4 Exponential Clock Multiplier
19.7.5 Linear Clock Multiplier
19.7.6 A Technique to Determine SCLKR, CLKPE, and CLKPM
MPC555
USER’S MANUAL
CSC
PE |
NOTES:
0
1
1. CMF clock frequency after SCKLR scaling. Example: A 40 MHz system clock scaled by 4 (SCLKR[0:2] = 0b101)
The second term in the pulse width timing equation is the exponential clock multiplier,
N. The program pulse number (pulse), clock period exponent (CLKPE), CSC, and PE
define the exponent in the 2
by the equation:
All of the exponents are shown in
The third term of the pulse width timing equation is the linear clock multiplier, M. The
clock period multiplier, CLKPM[0:6], defines a linear multiplier for the program or erase
pulse. The multiplier, M, is defined by the equation:
This allows for the program/erase pulse to be from one to 128 times the pulse set by
the system clock period, SCLKR[0:2] and CLKPE[0:1].
The default reset state of CLKPM[0:6] = 000 0000 for a multiplier of one.
The following example determines the values of the SCLKR, CLKPE, and CLKPM
fields for a 25.6 µs program pulse, PE = 0, in a system with a 40 MHz system clock.
results in an equivalent CMF clock of 10 MHz.
CLKPE[0:1]
/
00
01
10
11
00
01
10
11
MPC556
Table 19-13 Clock Period Exponent and Pulse Width Range
Exponent
(N)
15
16
17
18
5
6
7
8
2
16.384 ms
32.768 ms
4.096 ms
8.192 ms
N
8 MHz
N = 5 + CLKPE[0:1] + ((PE | CSC)
•1.25E-7
16 µs
32 µs
4 µs
8 µs
CDR MoneT FLASH EEPROM
N
Minimum Pulse Width
1
multiply of the clock period. The exponent, N, is defined
Rev. 15 October 2000
3.2 µs
6.4 µs
12.8 µs
25.6 µs
3.28 ms
6.55 ms
13.11 ms
26.21 ms
M = 1 + CLKPM[0:6]
Table
10 MHz
2
N
•1E-7
Pulse Width Range for all System Clock
Frequencies from 8.0 MHz to 40.0 MHz.
1
19-12.
2.7 µs
5.3 µs
10.7 µs
21.3 µs
2.73 ms
5.46 ms
10.92 ms
21.85 ms
2
N
12 MHz
•0.833E-7
1
512 µs
1.024 ms
2.048 ms
4.096 ms
524.29 ms
1.05 s
2.10 s
2
4.19 s
N
8 MHz
•1.25E-07
•
Maximum Pulse Width
10)
1
409.6 µs
819.2 µs
1.6384 ms
3.2768 ms
419.43 ms
838.86 ms
1.68 s
3.35 s
10 MHz
2
N
•1E-7
1
MOTOROLA
341.3 µs
682.7 µs
1.365 ms
2.731 ms
349.5 ms
699.1 ms
1.398 s
2.796 s
2
N
12 MHz
•0.833E-7
19-29
1